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Finding the Fourth Proportional to 86,408.72, 129,414.36 and 72,113.84

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Solution

The fourth proportional to 86,408.72, 129,414.36 and 72,113.84 is: 108,004.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,408.72 : 129,414.36 = 72,113.84 : x
  2. Step 2: Convert to fraction form
    86,408.72/129,414.36 = 72,113.84/x
  3. Step 3: Cross multiply
    86,408.72x = 129,414.36 × 72,113.84
  4. Step 4: Simplify right side
    86,408.72x = 9,332,566,450.74
  5. Step 5: Solve for x
    x = 9,332,566,450.74/86,408.72
  6. Step 6: Final answer
    x = 108,004.91

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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.