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Finding the Fourth Proportional to 308,753.76, 426,050.60 and 172,780.68

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Solution

The fourth proportional to 308,753.76, 426,050.60 and 172,780.68 is: 238,420.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,753.76 : 426,050.60 = 172,780.68 : x
  2. Step 2: Convert to fraction form
    308,753.76/426,050.60 = 172,780.68/x
  3. Step 3: Cross multiply
    308,753.76x = 426,050.60 × 172,780.68
  4. Step 4: Simplify right side
    308,753.76x = 73,613,312,382.41
  5. Step 5: Solve for x
    x = 73,613,312,382.41/308,753.76
  6. Step 6: Final answer
    x = 238,420.78

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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.