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Finding the Fourth Proportional to 391,151.68, 539,744.64 and 219,045.72

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Solution

The fourth proportional to 391,151.68, 539,744.64 and 219,045.72 is: 302,258.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,151.68 : 539,744.64 = 219,045.72 : x
  2. Step 2: Convert to fraction form
    391,151.68/539,744.64 = 219,045.72/x
  3. Step 3: Cross multiply
    391,151.68x = 539,744.64 × 219,045.72
  4. Step 4: Simplify right side
    391,151.68x = 118,228,753,284.94
  5. Step 5: Solve for x
    x = 118,228,753,284.94/391,151.68
  6. Step 6: Final answer
    x = 302,258.07

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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.