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Finding the Fourth Proportional to 98.61, 148.45 and 88.69

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Solution

The fourth proportional to 98.61, 148.45 and 88.69 is: 133.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.61 : 148.45 = 88.69 : x
  2. Step 2: Convert to fraction form
    98.61/148.45 = 88.69/x
  3. Step 3: Cross multiply
    98.61x = 148.45 × 88.69
  4. Step 4: Simplify right side
    98.61x = 13,165.44
  5. Step 5: Solve for x
    x = 13,165.44/98.61
  6. Step 6: Final answer
    x = 133.51

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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.