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Finding the Fourth Proportional to 391,363.68, 539,959.50 and 219,258.57

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Solution

The fourth proportional to 391,363.68, 539,959.50 and 219,258.57 is: 302,508.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,363.68 : 539,959.50 = 219,258.57 : x
  2. Step 2: Convert to fraction form
    391,363.68/539,959.50 = 219,258.57/x
  3. Step 3: Cross multiply
    391,363.68x = 539,959.50 × 219,258.57
  4. Step 4: Simplify right side
    391,363.68x = 118,390,747,827.92
  5. Step 5: Solve for x
    x = 118,390,747,827.92/391,363.68
  6. Step 6: Final answer
    x = 302,508.27

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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.