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Finding the Fourth Proportional to 391,130.88, 539,760.96 and 212,282.88

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Solution

The fourth proportional to 391,130.88, 539,760.96 and 212,282.88 is: 292,950.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,130.88 : 539,760.96 = 212,282.88 : x
  2. Step 2: Convert to fraction form
    391,130.88/539,760.96 = 212,282.88/x
  3. Step 3: Cross multiply
    391,130.88x = 539,760.96 × 212,282.88
  4. Step 4: Simplify right side
    391,130.88x = 114,582,011,100.37
  5. Step 5: Solve for x
    x = 114,582,011,100.37/391,130.88
  6. Step 6: Final answer
    x = 292,950.56

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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.