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Finding the Fourth Proportional to 128,411.10, 192,616.65 and 120,635.10

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Solution

The fourth proportional to 128,411.10, 192,616.65 and 120,635.10 is: 180,952.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,411.10 : 192,616.65 = 120,635.10 : x
  2. Step 2: Convert to fraction form
    128,411.10/192,616.65 = 120,635.10/x
  3. Step 3: Cross multiply
    128,411.10x = 192,616.65 × 120,635.10
  4. Step 4: Simplify right side
    128,411.10x = 23,236,328,834.42
  5. Step 5: Solve for x
    x = 23,236,328,834.42/128,411.10
  6. Step 6: Final answer
    x = 180,952.65

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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.