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Finding the Fourth Proportional to 128.01, 192.70 and 87.69

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Solution

The fourth proportional to 128.01, 192.70 and 87.69 is: 132.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.01 : 192.70 = 87.69 : x
  2. Step 2: Convert to fraction form
    128.01/192.70 = 87.69/x
  3. Step 3: Cross multiply
    128.01x = 192.70 × 87.69
  4. Step 4: Simplify right side
    128.01x = 16,897.86
  5. Step 5: Solve for x
    x = 16,897.86/128.01
  6. Step 6: Final answer
    x = 132.00

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.