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Finding the Fourth Proportional to 80,959.36, 121,332.42 and 45,420

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Solution

The fourth proportional to 80,959.36, 121,332.42 and 45,420 is: 68,070.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,959.36 : 121,332.42 = 45,420 : x
  2. Step 2: Convert to fraction form
    80,959.36/121,332.42 = 45,420/x
  3. Step 3: Cross multiply
    80,959.36x = 121,332.42 × 45,420
  4. Step 4: Simplify right side
    80,959.36x = 5,510,918,516.40
  5. Step 5: Solve for x
    x = 5,510,918,516.40/80,959.36
  6. Step 6: Final answer
    x = 68,070.19

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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.