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Finding the Fourth Proportional to 86,408.60, 129,612.90 and 71,646.35

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Solution

The fourth proportional to 86,408.60, 129,612.90 and 71,646.35 is: 107,469.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,408.60 : 129,612.90 = 71,646.35 : x
  2. Step 2: Convert to fraction form
    86,408.60/129,612.90 = 71,646.35/x
  3. Step 3: Cross multiply
    86,408.60x = 129,612.90 × 71,646.35
  4. Step 4: Simplify right side
    86,408.60x = 9,286,291,197.92
  5. Step 5: Solve for x
    x = 9,286,291,197.92/86,408.60
  6. Step 6: Final answer
    x = 107,469.53

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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.