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Finding the Fourth Proportional to 86,781.70, 130,172.55 and 67,098.70

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Solution

The fourth proportional to 86,781.70, 130,172.55 and 67,098.70 is: 100,648.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,781.70 : 130,172.55 = 67,098.70 : x
  2. Step 2: Convert to fraction form
    86,781.70/130,172.55 = 67,098.70/x
  3. Step 3: Cross multiply
    86,781.70x = 130,172.55 × 67,098.70
  4. Step 4: Simplify right side
    86,781.70x = 8,734,408,880.69
  5. Step 5: Solve for x
    x = 8,734,408,880.69/86,781.70
  6. Step 6: Final answer
    x = 100,648.05

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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.