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Finding the Fourth Proportional to 128.13, 176.71 and 86.67

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Solution

The fourth proportional to 128.13, 176.71 and 86.67 is: 119.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.13 : 176.71 = 86.67 : x
  2. Step 2: Convert to fraction form
    128.13/176.71 = 86.67/x
  3. Step 3: Cross multiply
    128.13x = 176.71 × 86.67
  4. Step 4: Simplify right side
    128.13x = 15,315.46
  5. Step 5: Solve for x
    x = 15,315.46/128.13
  6. Step 6: Final answer
    x = 119.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.