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Finding the Fourth Proportional to 687,807.20, 1,031,710.80 and 372,879.20

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Solution

The fourth proportional to 687,807.20, 1,031,710.80 and 372,879.20 is: 559,318.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,807.20 : 1,031,710.80 = 372,879.20 : x
  2. Step 2: Convert to fraction form
    687,807.20/1,031,710.80 = 372,879.20/x
  3. Step 3: Cross multiply
    687,807.20x = 1,031,710.80 × 372,879.20
  4. Step 4: Simplify right side
    687,807.20x = 384,703,497,735.36
  5. Step 5: Solve for x
    x = 384,703,497,735.36/687,807.20
  6. Step 6: Final answer
    x = 559,318.80

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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.