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Finding the Fourth Proportional to 98.88, 148.40 and 86.16

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Solution

The fourth proportional to 98.88, 148.40 and 86.16 is: 129.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.88 : 148.40 = 86.16 : x
  2. Step 2: Convert to fraction form
    98.88/148.40 = 86.16/x
  3. Step 3: Cross multiply
    98.88x = 148.40 × 86.16
  4. Step 4: Simplify right side
    98.88x = 12,786.14
  5. Step 5: Solve for x
    x = 12,786.14/98.88
  6. Step 6: Final answer
    x = 129.31

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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.