Home / 81,324.48-121,985.28-31,415.52

Finding the Fourth Proportional to 81,324.48, 121,985.28 and 31,415.52

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Solution

The fourth proportional to 81,324.48, 121,985.28 and 31,415.52 is: 47,122.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,324.48 : 121,985.28 = 31,415.52 : x
  2. Step 2: Convert to fraction form
    81,324.48/121,985.28 = 31,415.52/x
  3. Step 3: Cross multiply
    81,324.48x = 121,985.28 × 31,415.52
  4. Step 4: Simplify right side
    81,324.48x = 3,832,231,003.55
  5. Step 5: Solve for x
    x = 3,832,231,003.55/81,324.48
  6. Step 6: Final answer
    x = 47,122.72

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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.