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Finding the Fourth Proportional to 219,913.62, 329,648.49 and 86,720.46

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Solution

The fourth proportional to 219,913.62, 329,648.49 and 86,720.46 is: 129,993.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,913.62 : 329,648.49 = 86,720.46 : x
  2. Step 2: Convert to fraction form
    219,913.62/329,648.49 = 86,720.46/x
  3. Step 3: Cross multiply
    219,913.62x = 329,648.49 × 86,720.46
  4. Step 4: Simplify right side
    219,913.62x = 28,587,268,691.11
  5. Step 5: Solve for x
    x = 28,587,268,691.11/219,913.62
  6. Step 6: Final answer
    x = 129,993.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.