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Finding the Fourth Proportional to 717,956.62, 990,786.90 and 395,678.32

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Solution

The fourth proportional to 717,956.62, 990,786.90 and 395,678.32 is: 546,039.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,956.62 : 990,786.90 = 395,678.32 : x
  2. Step 2: Convert to fraction form
    717,956.62/990,786.90 = 395,678.32/x
  3. Step 3: Cross multiply
    717,956.62x = 990,786.90 × 395,678.32
  4. Step 4: Simplify right side
    717,956.62x = 392,032,896,070.01
  5. Step 5: Solve for x
    x = 392,032,896,070.01/717,956.62
  6. Step 6: Final answer
    x = 546,039.81

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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.