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Finding the Fourth Proportional to 81,113.92, 121,689.60 and 34,368.64

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Solution

The fourth proportional to 81,113.92, 121,689.60 and 34,368.64 is: 51,560.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,113.92 : 121,689.60 = 34,368.64 : x
  2. Step 2: Convert to fraction form
    81,113.92/121,689.60 = 34,368.64/x
  3. Step 3: Cross multiply
    81,113.92x = 121,689.60 × 34,368.64
  4. Step 4: Simplify right side
    81,113.92x = 4,182,306,054.14
  5. Step 5: Solve for x
    x = 4,182,306,054.14/81,113.92
  6. Step 6: Final answer
    x = 51,560.89

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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.