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Finding the Fourth Proportional to 720,816.72, 994,686.90 and 398,508

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Solution

The fourth proportional to 720,816.72, 994,686.90 and 398,508 is: 549,918.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,816.72 : 994,686.90 = 398,508 : x
  2. Step 2: Convert to fraction form
    720,816.72/994,686.90 = 398,508/x
  3. Step 3: Cross multiply
    720,816.72x = 994,686.90 × 398,508
  4. Step 4: Simplify right side
    720,816.72x = 396,390,687,145.20
  5. Step 5: Solve for x
    x = 396,390,687,145.20/720,816.72
  6. Step 6: Final answer
    x = 549,918.83

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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.