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Finding the Fourth Proportional to 71,640.40, 98,859.23 and 39,807.40

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Solution

The fourth proportional to 71,640.40, 98,859.23 and 39,807.40 is: 54,931.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,640.40 : 98,859.23 = 39,807.40 : x
  2. Step 2: Convert to fraction form
    71,640.40/98,859.23 = 39,807.40/x
  3. Step 3: Cross multiply
    71,640.40x = 98,859.23 × 39,807.40
  4. Step 4: Simplify right side
    71,640.40x = 3,935,328,912.30
  5. Step 5: Solve for x
    x = 3,935,328,912.30/71,640.40
  6. Step 6: Final answer
    x = 54,931.70

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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.