Home / 15,405.40-21,259.38-8,331.76

Finding the Fourth Proportional to 15,405.40, 21,259.38 and 8,331.76

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Solution

The fourth proportional to 15,405.40, 21,259.38 and 8,331.76 is: 11,497.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,405.40 : 21,259.38 = 8,331.76 : x
  2. Step 2: Convert to fraction form
    15,405.40/21,259.38 = 8,331.76/x
  3. Step 3: Cross multiply
    15,405.40x = 21,259.38 × 8,331.76
  4. Step 4: Simplify right side
    15,405.40x = 177,128,051.91
  5. Step 5: Solve for x
    x = 177,128,051.91/15,405.40
  6. Step 6: Final answer
    x = 11,497.79

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Half scale
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Double scale
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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.