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Finding the Fourth Proportional to 388,663.28, 581,678.16 and 238,998.38

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Solution

The fourth proportional to 388,663.28, 581,678.16 and 238,998.38 is: 357,687.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,663.28 : 581,678.16 = 238,998.38 : x
  2. Step 2: Convert to fraction form
    388,663.28/581,678.16 = 238,998.38/x
  3. Step 3: Cross multiply
    388,663.28x = 581,678.16 × 238,998.38
  4. Step 4: Simplify right side
    388,663.28x = 139,020,137,921.38
  5. Step 5: Solve for x
    x = 139,020,137,921.38/388,663.28
  6. Step 6: Final answer
    x = 357,687.86

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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.