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Finding the Fourth Proportional to 711,080.76, 981,291.33 and 388,790.76

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Solution

The fourth proportional to 711,080.76, 981,291.33 and 388,790.76 is: 536,531.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,080.76 : 981,291.33 = 388,790.76 : x
  2. Step 2: Convert to fraction form
    711,080.76/981,291.33 = 388,790.76/x
  3. Step 3: Cross multiply
    711,080.76x = 981,291.33 × 388,790.76
  4. Step 4: Simplify right side
    711,080.76x = 381,517,001,972.11
  5. Step 5: Solve for x
    x = 381,517,001,972.11/711,080.76
  6. Step 6: Final answer
    x = 536,531.18

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Double scale
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1.5x scale

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.