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Finding the Fourth Proportional to 81,330.90, 121,959.90 and 31,394.40

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Solution

The fourth proportional to 81,330.90, 121,959.90 and 31,394.40 is: 47,077.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,330.90 : 121,959.90 = 31,394.40 : x
  2. Step 2: Convert to fraction form
    81,330.90/121,959.90 = 31,394.40/x
  3. Step 3: Cross multiply
    81,330.90x = 121,959.90 × 31,394.40
  4. Step 4: Simplify right side
    81,330.90x = 3,828,857,884.56
  5. Step 5: Solve for x
    x = 3,828,857,884.56/81,330.90
  6. Step 6: Final answer
    x = 47,077.53

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1.5x scale

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.