Home / 81,335.52-121,462.02-80,455.86

Finding the Fourth Proportional to 81,335.52, 121,462.02 and 80,455.86

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Solution

The fourth proportional to 81,335.52, 121,462.02 and 80,455.86 is: 120,148.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,335.52 : 121,462.02 = 80,455.86 : x
  2. Step 2: Convert to fraction form
    81,335.52/121,462.02 = 80,455.86/x
  3. Step 3: Cross multiply
    81,335.52x = 121,462.02 × 80,455.86
  4. Step 4: Simplify right side
    81,335.52x = 9,772,331,276.44
  5. Step 5: Solve for x
    x = 9,772,331,276.44/81,335.52
  6. Step 6: Final answer
    x = 120,148.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.