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Finding the Fourth Proportional to 717,927.90, 990,740.71 and 391,241

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Solution

The fourth proportional to 717,927.90, 990,740.71 and 391,241 is: 539,912.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,927.90 : 990,740.71 = 391,241 : x
  2. Step 2: Convert to fraction form
    717,927.90/990,740.71 = 391,241/x
  3. Step 3: Cross multiply
    717,927.90x = 990,740.71 × 391,241
  4. Step 4: Simplify right side
    717,927.90x = 387,618,386,121.11
  5. Step 5: Solve for x
    x = 387,618,386,121.11/717,927.90
  6. Step 6: Final answer
    x = 539,912.69

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1.5x scale

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.