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Finding the Fourth Proportional to 85,418.10, 128,127.15 and 80,825.40

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Solution

The fourth proportional to 85,418.10, 128,127.15 and 80,825.40 is: 121,238.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,418.10 : 128,127.15 = 80,825.40 : x
  2. Step 2: Convert to fraction form
    85,418.10/128,127.15 = 80,825.40/x
  3. Step 3: Cross multiply
    85,418.10x = 128,127.15 × 80,825.40
  4. Step 4: Simplify right side
    85,418.10x = 10,355,928,149.61
  5. Step 5: Solve for x
    x = 10,355,928,149.61/85,418.10
  6. Step 6: Final answer
    x = 121,238.10

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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.