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Finding the Fourth Proportional to 86,408.40, 129,612.60 and 68,912.40

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Solution

The fourth proportional to 86,408.40, 129,612.60 and 68,912.40 is: 103,368.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,408.40 : 129,612.60 = 68,912.40 : x
  2. Step 2: Convert to fraction form
    86,408.40/129,612.60 = 68,912.40/x
  3. Step 3: Cross multiply
    86,408.40x = 129,612.60 × 68,912.40
  4. Step 4: Simplify right side
    86,408.40x = 8,931,915,336.24
  5. Step 5: Solve for x
    x = 8,931,915,336.24/86,408.40
  6. Step 6: Final answer
    x = 103,368.60

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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.