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Finding the Fourth Proportional to 717,642, 990,391.32 and 395,352.72

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Solution

The fourth proportional to 717,642, 990,391.32 and 395,352.72 is: 545,611.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,642 : 990,391.32 = 395,352.72 : x
  2. Step 2: Convert to fraction form
    717,642/990,391.32 = 395,352.72/x
  3. Step 3: Cross multiply
    717,642x = 990,391.32 × 395,352.72
  4. Step 4: Simplify right side
    717,642x = 391,553,902,226.39
  5. Step 5: Solve for x
    x = 391,553,902,226.39/717,642
  6. Step 6: Final answer
    x = 545,611.74

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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.