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Finding the Fourth Proportional to 81,691.84, 112,729.52 and 45,880.88

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Solution

The fourth proportional to 81,691.84, 112,729.52 and 45,880.88 is: 63,312.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,691.84 : 112,729.52 = 45,880.88 : x
  2. Step 2: Convert to fraction form
    81,691.84/112,729.52 = 45,880.88/x
  3. Step 3: Cross multiply
    81,691.84x = 112,729.52 × 45,880.88
  4. Step 4: Simplify right side
    81,691.84x = 5,172,129,579.58
  5. Step 5: Solve for x
    x = 5,172,129,579.58/81,691.84
  6. Step 6: Final answer
    x = 63,312.68

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1.5x scale

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.