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Finding the Fourth Proportional to 391,079.52, 539,689.68 and 212,231.52

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Solution

The fourth proportional to 391,079.52, 539,689.68 and 212,231.52 is: 292,879.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,079.52 : 539,689.68 = 212,231.52 : x
  2. Step 2: Convert to fraction form
    391,079.52/539,689.68 = 212,231.52/x
  3. Step 3: Cross multiply
    391,079.52x = 539,689.68 × 212,231.52
  4. Step 4: Simplify right side
    391,079.52x = 114,539,161,114.71
  5. Step 5: Solve for x
    x = 114,539,161,114.71/391,079.52
  6. Step 6: Final answer
    x = 292,879.47

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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.