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Finding the Fourth Proportional to 391,301.15, 539,873.02 and 219,195.87

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Solution

The fourth proportional to 391,301.15, 539,873.02 and 219,195.87 is: 302,421.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,301.15 : 539,873.02 = 219,195.87 : x
  2. Step 2: Convert to fraction form
    391,301.15/539,873.02 = 219,195.87/x
  3. Step 3: Cross multiply
    391,301.15x = 539,873.02 × 219,195.87
  4. Step 4: Simplify right side
    391,301.15x = 118,337,938,211.17
  5. Step 5: Solve for x
    x = 118,337,938,211.17/391,301.15
  6. Step 6: Final answer
    x = 302,421.64

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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.