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Finding the Fourth Proportional to 717,873.50, 990,661.18 and 391,185.92

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Solution

The fourth proportional to 717,873.50, 990,661.18 and 391,185.92 is: 539,834.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,873.50 : 990,661.18 = 391,185.92 : x
  2. Step 2: Convert to fraction form
    717,873.50/990,661.18 = 391,185.92/x
  3. Step 3: Cross multiply
    717,873.50x = 990,661.18 × 391,185.92
  4. Step 4: Simplify right side
    717,873.50x = 387,532,705,106.59
  5. Step 5: Solve for x
    x = 387,532,705,106.59/717,873.50
  6. Step 6: Final answer
    x = 539,834.25

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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.