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Finding the Fourth Proportional to 99.15, 148.60 and 86.94

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Solution

The fourth proportional to 99.15, 148.60 and 86.94 is: 130.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.15 : 148.60 = 86.94 : x
  2. Step 2: Convert to fraction form
    99.15/148.60 = 86.94/x
  3. Step 3: Cross multiply
    99.15x = 148.60 × 86.94
  4. Step 4: Simplify right side
    99.15x = 12,919.28
  5. Step 5: Solve for x
    x = 12,919.28/99.15
  6. Step 6: Final answer
    x = 130.30

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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.