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Finding the Fourth Proportional to 128,937.84, 177,935.85 and 72,348

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Solution

The fourth proportional to 128,937.84, 177,935.85 and 72,348 is: 99,841.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,937.84 : 177,935.85 = 72,348 : x
  2. Step 2: Convert to fraction form
    128,937.84/177,935.85 = 72,348/x
  3. Step 3: Cross multiply
    128,937.84x = 177,935.85 × 72,348
  4. Step 4: Simplify right side
    128,937.84x = 12,873,302,875.80
  5. Step 5: Solve for x
    x = 12,873,302,875.80/128,937.84
  6. Step 6: Final answer
    x = 99,841.16

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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.