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Finding the Fourth Proportional to 15,143.71, 20,899.31 and 10,104.72

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Solution

The fourth proportional to 15,143.71, 20,899.31 and 10,104.72 is: 13,945.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,143.71 : 20,899.31 = 10,104.72 : x
  2. Step 2: Convert to fraction form
    15,143.71/20,899.31 = 10,104.72/x
  3. Step 3: Cross multiply
    15,143.71x = 20,899.31 × 10,104.72
  4. Step 4: Simplify right side
    15,143.71x = 211,181,772.92
  5. Step 5: Solve for x
    x = 211,181,772.92/15,143.71
  6. Step 6: Final answer
    x = 13,945.18

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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.