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Finding the Fourth Proportional to 258,188.80, 387,166.56 and 91,981.12

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Solution

The fourth proportional to 258,188.80, 387,166.56 and 91,981.12 is: 137,930.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,188.80 : 387,166.56 = 91,981.12 : x
  2. Step 2: Convert to fraction form
    258,188.80/387,166.56 = 91,981.12/x
  3. Step 3: Cross multiply
    258,188.80x = 387,166.56 × 91,981.12
  4. Step 4: Simplify right side
    258,188.80x = 35,612,013,815.35
  5. Step 5: Solve for x
    x = 35,612,013,815.35/258,188.80
  6. Step 6: Final answer
    x = 137,930.13

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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.