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Finding the Fourth Proportional to 717,871.50, 990,658.42 and 391,183.92

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Solution

The fourth proportional to 717,871.50, 990,658.42 and 391,183.92 is: 539,831.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,871.50 : 990,658.42 = 391,183.92 : x
  2. Step 2: Convert to fraction form
    717,871.50/990,658.42 = 391,183.92/x
  3. Step 3: Cross multiply
    717,871.50x = 990,658.42 × 391,183.92
  4. Step 4: Simplify right side
    717,871.50x = 387,529,643,138.65
  5. Step 5: Solve for x
    x = 387,529,643,138.65/717,871.50
  6. Step 6: Final answer
    x = 539,831.49

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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.