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Finding the Fourth Proportional to 10,085.20, 15,127.80 and 8,472.40

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Solution

The fourth proportional to 10,085.20, 15,127.80 and 8,472.40 is: 12,708.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,085.20 : 15,127.80 = 8,472.40 : x
  2. Step 2: Convert to fraction form
    10,085.20/15,127.80 = 8,472.40/x
  3. Step 3: Cross multiply
    10,085.20x = 15,127.80 × 8,472.40
  4. Step 4: Simplify right side
    10,085.20x = 128,168,772.72
  5. Step 5: Solve for x
    x = 128,168,772.72/10,085.20
  6. Step 6: Final answer
    x = 12,708.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.