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Finding the Fourth Proportional to 81,263.40, 121,845.90 and 53,149.52

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Solution

The fourth proportional to 81,263.40, 121,845.90 and 53,149.52 is: 79,692.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,263.40 : 121,845.90 = 53,149.52 : x
  2. Step 2: Convert to fraction form
    81,263.40/121,845.90 = 53,149.52/x
  3. Step 3: Cross multiply
    81,263.40x = 121,845.90 × 53,149.52
  4. Step 4: Simplify right side
    81,263.40x = 6,476,051,098.97
  5. Step 5: Solve for x
    x = 6,476,051,098.97/81,263.40
  6. Step 6: Final answer
    x = 79,692.10

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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.