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Finding the Fourth Proportional to 81,340.40, 112,170.89 and 63,428.87

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Solution

The fourth proportional to 81,340.40, 112,170.89 and 63,428.87 is: 87,470.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,340.40 : 112,170.89 = 63,428.87 : x
  2. Step 2: Convert to fraction form
    81,340.40/112,170.89 = 63,428.87/x
  3. Step 3: Cross multiply
    81,340.40x = 112,170.89 × 63,428.87
  4. Step 4: Simplify right side
    81,340.40x = 7,114,873,238.59
  5. Step 5: Solve for x
    x = 7,114,873,238.59/81,340.40
  6. Step 6: Final answer
    x = 87,470.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.