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Finding the Fourth Proportional to 219,447.55, 329,253.30 and 86,420.53

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Solution

The fourth proportional to 219,447.55, 329,253.30 and 86,420.53 is: 129,663.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,447.55 : 329,253.30 = 86,420.53 : x
  2. Step 2: Convert to fraction form
    219,447.55/329,253.30 = 86,420.53/x
  3. Step 3: Cross multiply
    219,447.55x = 329,253.30 × 86,420.53
  4. Step 4: Simplify right side
    219,447.55x = 28,454,244,690.25
  5. Step 5: Solve for x
    x = 28,454,244,690.25/219,447.55
  6. Step 6: Final answer
    x = 129,663.08

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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.