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Finding the Fourth Proportional to 711,083.61, 981,288.68 and 388,790.28

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Solution

The fourth proportional to 711,083.61, 981,288.68 and 388,790.28 is: 536,526.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,083.61 : 981,288.68 = 388,790.28 : x
  2. Step 2: Convert to fraction form
    711,083.61/981,288.68 = 388,790.28/x
  3. Step 3: Cross multiply
    711,083.61x = 981,288.68 × 388,790.28
  4. Step 4: Simplify right side
    711,083.61x = 381,515,498,714.08
  5. Step 5: Solve for x
    x = 381,515,498,714.08/711,083.61
  6. Step 6: Final answer
    x = 536,526.92

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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.