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Finding the Fourth Proportional to 121,437.70, 181,937.85 and 74,635.90

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Solution

The fourth proportional to 121,437.70, 181,937.85 and 74,635.90 is: 111,819.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,437.70 : 181,937.85 = 74,635.90 : x
  2. Step 2: Convert to fraction form
    121,437.70/181,937.85 = 74,635.90/x
  3. Step 3: Cross multiply
    121,437.70x = 181,937.85 × 74,635.90
  4. Step 4: Simplify right side
    121,437.70x = 13,579,095,178.82
  5. Step 5: Solve for x
    x = 13,579,095,178.82/121,437.70
  6. Step 6: Final answer
    x = 111,819.44

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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.