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Finding the Fourth Proportional to 711,130.64, 981,279.92 and 420,751.11

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Solution

The fourth proportional to 711,130.64, 981,279.92 and 420,751.11 is: 580,588.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    711,130.64 : 981,279.92 = 420,751.11 : x
  2. Step 2: Convert to fraction form
    711,130.64/981,279.92 = 420,751.11/x
  3. Step 3: Cross multiply
    711,130.64x = 981,279.92 × 420,751.11
  4. Step 4: Simplify right side
    711,130.64x = 412,874,613,456.96
  5. Step 5: Solve for x
    x = 412,874,613,456.96/711,130.64
  6. Step 6: Final answer
    x = 580,588.98

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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.