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Finding the Fourth Proportional to 391,127, 539,755.34 and 212,279

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Solution

The fourth proportional to 391,127, 539,755.34 and 212,279 is: 292,945.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,127 : 539,755.34 = 212,279 : x
  2. Step 2: Convert to fraction form
    391,127/539,755.34 = 212,279/x
  3. Step 3: Cross multiply
    391,127x = 539,755.34 × 212,279
  4. Step 4: Simplify right side
    391,127x = 114,578,723,819.86
  5. Step 5: Solve for x
    x = 114,578,723,819.86/391,127
  6. Step 6: Final answer
    x = 292,945.06

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1.5x scale

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.