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Finding the Fourth Proportional to 81,358.40, 121,894.08 and 71,250.36

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Solution

The fourth proportional to 81,358.40, 121,894.08 and 71,250.36 is: 106,749.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,358.40 : 121,894.08 = 71,250.36 : x
  2. Step 2: Convert to fraction form
    81,358.40/121,894.08 = 71,250.36/x
  3. Step 3: Cross multiply
    81,358.40x = 121,894.08 × 71,250.36
  4. Step 4: Simplify right side
    81,358.40x = 8,684,997,081.87
  5. Step 5: Solve for x
    x = 8,684,997,081.87/81,358.40
  6. Step 6: Final answer
    x = 106,749.85

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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.