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Finding the Fourth Proportional to 391,064.20, 539,389.82 and 358,902.49

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Solution

The fourth proportional to 391,064.20, 539,389.82 and 358,902.49 is: 495,029.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,064.20 : 539,389.82 = 358,902.49 : x
  2. Step 2: Convert to fraction form
    391,064.20/539,389.82 = 358,902.49/x
  3. Step 3: Cross multiply
    391,064.20x = 539,389.82 × 358,902.49
  4. Step 4: Simplify right side
    391,064.20x = 193,588,347,684.14
  5. Step 5: Solve for x
    x = 193,588,347,684.14/391,064.20
  6. Step 6: Final answer
    x = 495,029.58

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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.