Home / 81,281.07-121,931.98-31,375.43

Finding the Fourth Proportional to 81,281.07, 121,931.98 and 31,375.43

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Solution

The fourth proportional to 81,281.07, 121,931.98 and 31,375.43 is: 47,067.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,281.07 : 121,931.98 = 31,375.43 : x
  2. Step 2: Convert to fraction form
    81,281.07/121,931.98 = 31,375.43/x
  3. Step 3: Cross multiply
    81,281.07x = 121,931.98 × 31,375.43
  4. Step 4: Simplify right side
    81,281.07x = 3,825,668,647.30
  5. Step 5: Solve for x
    x = 3,825,668,647.30/81,281.07
  6. Step 6: Final answer
    x = 47,067.16

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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.