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Finding the Fourth Proportional to 86.23, 130.03 and 84.61

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Solution

The fourth proportional to 86.23, 130.03 and 84.61 is: 127.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.23 : 130.03 = 84.61 : x
  2. Step 2: Convert to fraction form
    86.23/130.03 = 84.61/x
  3. Step 3: Cross multiply
    86.23x = 130.03 × 84.61
  4. Step 4: Simplify right side
    86.23x = 11,001.84
  5. Step 5: Solve for x
    x = 11,001.84/86.23
  6. Step 6: Final answer
    x = 127.59

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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.