Home / 81,275.66-121,948.37-31,390.79

Finding the Fourth Proportional to 81,275.66, 121,948.37 and 31,390.79

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Solution

The fourth proportional to 81,275.66, 121,948.37 and 31,390.79 is: 47,099.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,275.66 : 121,948.37 = 31,390.79 : x
  2. Step 2: Convert to fraction form
    81,275.66/121,948.37 = 31,390.79/x
  3. Step 3: Cross multiply
    81,275.66x = 121,948.37 × 31,390.79
  4. Step 4: Simplify right side
    81,275.66x = 3,828,055,024.53
  5. Step 5: Solve for x
    x = 3,828,055,024.53/81,275.66
  6. Step 6: Final answer
    x = 47,099.65

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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.