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Finding the Fourth Proportional to 128,486.12, 192,728.57 and 85,701.11

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Solution

The fourth proportional to 128,486.12, 192,728.57 and 85,701.11 is: 128,551.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,486.12 : 192,728.57 = 85,701.11 : x
  2. Step 2: Convert to fraction form
    128,486.12/192,728.57 = 85,701.11/x
  3. Step 3: Cross multiply
    128,486.12x = 192,728.57 × 85,701.11
  4. Step 4: Simplify right side
    128,486.12x = 16,517,052,377.71
  5. Step 5: Solve for x
    x = 16,517,052,377.71/128,486.12
  6. Step 6: Final answer
    x = 128,551.26

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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.