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Finding the Fourth Proportional to 717,418.86, 990,082.97 and 395,128.88

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Solution

The fourth proportional to 717,418.86, 990,082.97 and 395,128.88 is: 545,302.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,418.86 : 990,082.97 = 395,128.88 : x
  2. Step 2: Convert to fraction form
    717,418.86/990,082.97 = 395,128.88/x
  3. Step 3: Cross multiply
    717,418.86x = 990,082.97 × 395,128.88
  4. Step 4: Simplify right side
    717,418.86x = 391,210,368,117.11
  5. Step 5: Solve for x
    x = 391,210,368,117.11/717,418.86
  6. Step 6: Final answer
    x = 545,302.60

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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.