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Finding the Fourth Proportional to 21,990.45, 30,331.08 and 15,187.08

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Solution

The fourth proportional to 21,990.45, 30,331.08 and 15,187.08 is: 20,947.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.45 : 30,331.08 = 15,187.08 : x
  2. Step 2: Convert to fraction form
    21,990.45/30,331.08 = 15,187.08/x
  3. Step 3: Cross multiply
    21,990.45x = 30,331.08 × 15,187.08
  4. Step 4: Simplify right side
    21,990.45x = 460,640,538.45
  5. Step 5: Solve for x
    x = 460,640,538.45/21,990.45
  6. Step 6: Final answer
    x = 20,947.30

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.