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Finding the Fourth Proportional to 261,805.40, 392,708.10 and 137,130.20

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Solution

The fourth proportional to 261,805.40, 392,708.10 and 137,130.20 is: 205,695.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,805.40 : 392,708.10 = 137,130.20 : x
  2. Step 2: Convert to fraction form
    261,805.40/392,708.10 = 137,130.20/x
  3. Step 3: Cross multiply
    261,805.40x = 392,708.10 × 137,130.20
  4. Step 4: Simplify right side
    261,805.40x = 53,852,140,294.62
  5. Step 5: Solve for x
    x = 53,852,140,294.62/261,805.40
  6. Step 6: Final answer
    x = 205,695.30

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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.