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Finding the Fourth Proportional to 128,045.90, 192,068.85 and 81,505.10

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Solution

The fourth proportional to 128,045.90, 192,068.85 and 81,505.10 is: 122,257.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,045.90 : 192,068.85 = 81,505.10 : x
  2. Step 2: Convert to fraction form
    128,045.90/192,068.85 = 81,505.10/x
  3. Step 3: Cross multiply
    128,045.90x = 192,068.85 × 81,505.10
  4. Step 4: Simplify right side
    128,045.90x = 15,654,590,826.14
  5. Step 5: Solve for x
    x = 15,654,590,826.14/128,045.90
  6. Step 6: Final answer
    x = 122,257.65

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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.