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Finding the Fourth Proportional to 308,458.50, 425,669.78 and 172,490.88

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Solution

The fourth proportional to 308,458.50, 425,669.78 and 172,490.88 is: 238,035.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,458.50 : 425,669.78 = 172,490.88 : x
  2. Step 2: Convert to fraction form
    308,458.50/425,669.78 = 172,490.88/x
  3. Step 3: Cross multiply
    308,458.50x = 425,669.78 × 172,490.88
  4. Step 4: Simplify right side
    308,458.50x = 73,424,154,079.15
  5. Step 5: Solve for x
    x = 73,424,154,079.15/308,458.50
  6. Step 6: Final answer
    x = 238,035.76

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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.