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Finding the Fourth Proportional to 121,042.60, 181,385.70 and 87,832.60

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Solution

The fourth proportional to 121,042.60, 181,385.70 and 87,832.60 is: 131,619.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,042.60 : 181,385.70 = 87,832.60 : x
  2. Step 2: Convert to fraction form
    121,042.60/181,385.70 = 87,832.60/x
  3. Step 3: Cross multiply
    121,042.60x = 181,385.70 × 87,832.60
  4. Step 4: Simplify right side
    121,042.60x = 15,931,577,633.82
  5. Step 5: Solve for x
    x = 15,931,577,633.82/121,042.60
  6. Step 6: Final answer
    x = 131,619.59

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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.