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Finding the Fourth Proportional to 398,591.04, 552,429.78 and 391,126.08

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Solution

The fourth proportional to 398,591.04, 552,429.78 and 391,126.08 is: 542,083.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,591.04 : 552,429.78 = 391,126.08 : x
  2. Step 2: Convert to fraction form
    398,591.04/552,429.78 = 391,126.08/x
  3. Step 3: Cross multiply
    398,591.04x = 552,429.78 × 391,126.08
  4. Step 4: Simplify right side
    398,591.04x = 216,069,694,326.66
  5. Step 5: Solve for x
    x = 216,069,694,326.66/398,591.04
  6. Step 6: Final answer
    x = 542,083.67

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.