Home / 21,990.76-30,330.30-15,276.28

Finding the Fourth Proportional to 21,990.76, 30,330.30 and 15,276.28

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Solution

The fourth proportional to 21,990.76, 30,330.30 and 15,276.28 is: 21,069.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.76 : 30,330.30 = 15,276.28 : x
  2. Step 2: Convert to fraction form
    21,990.76/30,330.30 = 15,276.28/x
  3. Step 3: Cross multiply
    21,990.76x = 30,330.30 × 15,276.28
  4. Step 4: Simplify right side
    21,990.76x = 463,334,155.28
  5. Step 5: Solve for x
    x = 463,334,155.28/21,990.76
  6. Step 6: Final answer
    x = 21,069.49

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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.