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Finding the Fourth Proportional to 98.79, 148.15 and 89.61

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Solution

The fourth proportional to 98.79, 148.15 and 89.61 is: 134.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.79 : 148.15 = 89.61 : x
  2. Step 2: Convert to fraction form
    98.79/148.15 = 89.61/x
  3. Step 3: Cross multiply
    98.79x = 148.15 × 89.61
  4. Step 4: Simplify right side
    98.79x = 13,275.72
  5. Step 5: Solve for x
    x = 13,275.72/98.79
  6. Step 6: Final answer
    x = 134.38

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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.