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Finding the Fourth Proportional to 717,658.58, 990,366.55 and 395,365.86

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Solution

The fourth proportional to 717,658.58, 990,366.55 and 395,365.86 is: 545,603.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,658.58 : 990,366.55 = 395,365.86 : x
  2. Step 2: Convert to fraction form
    717,658.58/990,366.55 = 395,365.86/x
  3. Step 3: Cross multiply
    717,658.58x = 990,366.55 × 395,365.86
  4. Step 4: Simplify right side
    717,658.58x = 391,557,121,767.57
  5. Step 5: Solve for x
    x = 391,557,121,767.57/717,658.58
  6. Step 6: Final answer
    x = 545,603.62

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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.