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Finding the Fourth Proportional to 717,864.64, 990,697.12 and 395,574.80

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Solution

The fourth proportional to 717,864.64, 990,697.12 and 395,574.80 is: 545,917.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,864.64 : 990,697.12 = 395,574.80 : x
  2. Step 2: Convert to fraction form
    717,864.64/990,697.12 = 395,574.80/x
  3. Step 3: Cross multiply
    717,864.64x = 990,697.12 × 395,574.80
  4. Step 4: Simplify right side
    717,864.64x = 391,894,815,104.58
  5. Step 5: Solve for x
    x = 391,894,815,104.58/717,864.64
  6. Step 6: Final answer
    x = 545,917.42

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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.