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Finding the Fourth Proportional to 261,957.70, 392,936.55 and 72,417.70

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Solution

The fourth proportional to 261,957.70, 392,936.55 and 72,417.70 is: 108,626.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,957.70 : 392,936.55 = 72,417.70 : x
  2. Step 2: Convert to fraction form
    261,957.70/392,936.55 = 72,417.70/x
  3. Step 3: Cross multiply
    261,957.70x = 392,936.55 × 72,417.70
  4. Step 4: Simplify right side
    261,957.70x = 28,455,561,196.94
  5. Step 5: Solve for x
    x = 28,455,561,196.94/261,957.70
  6. Step 6: Final answer
    x = 108,626.55

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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.