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Finding the Fourth Proportional to 86.58, 130.11 and 84.30

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Solution

The fourth proportional to 86.58, 130.11 and 84.30 is: 126.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.58 : 130.11 = 84.30 : x
  2. Step 2: Convert to fraction form
    86.58/130.11 = 84.30/x
  3. Step 3: Cross multiply
    86.58x = 130.11 × 84.30
  4. Step 4: Simplify right side
    86.58x = 10,968.27
  5. Step 5: Solve for x
    x = 10,968.27/86.58
  6. Step 6: Final answer
    x = 126.68

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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.