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Finding the Fourth Proportional to 121,042.60, 181,520.70 and 42,159.40

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Solution

The fourth proportional to 121,042.60, 181,520.70 and 42,159.40 is: 63,224.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,042.60 : 181,520.70 = 42,159.40 : x
  2. Step 2: Convert to fraction form
    121,042.60/181,520.70 = 42,159.40/x
  3. Step 3: Cross multiply
    121,042.60x = 181,520.70 × 42,159.40
  4. Step 4: Simplify right side
    121,042.60x = 7,652,803,799.58
  5. Step 5: Solve for x
    x = 7,652,803,799.58/121,042.60
  6. Step 6: Final answer
    x = 63,224.05

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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.