Home / 85,424.10-128,136.15-81,147.30

Finding the Fourth Proportional to 85,424.10, 128,136.15 and 81,147.30

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Solution

The fourth proportional to 85,424.10, 128,136.15 and 81,147.30 is: 121,720.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,424.10 : 128,136.15 = 81,147.30 : x
  2. Step 2: Convert to fraction form
    85,424.10/128,136.15 = 81,147.30/x
  3. Step 3: Cross multiply
    85,424.10x = 128,136.15 × 81,147.30
  4. Step 4: Simplify right side
    85,424.10x = 10,397,902,604.90
  5. Step 5: Solve for x
    x = 10,397,902,604.90/85,424.10
  6. Step 6: Final answer
    x = 121,720.95

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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.