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Finding the Fourth Proportional to 261,085.25, 391,665.25 and 99,038.88

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Solution

The fourth proportional to 261,085.25, 391,665.25 and 99,038.88 is: 148,572.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,085.25 : 391,665.25 = 99,038.88 : x
  2. Step 2: Convert to fraction form
    261,085.25/391,665.25 = 99,038.88/x
  3. Step 3: Cross multiply
    261,085.25x = 391,665.25 × 99,038.88
  4. Step 4: Simplify right side
    261,085.25x = 38,790,087,694.92
  5. Step 5: Solve for x
    x = 38,790,087,694.92/261,085.25
  6. Step 6: Final answer
    x = 148,572.50

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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.