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Finding the Fourth Proportional to 115.64, 159.36 and 100.88

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Solution

The fourth proportional to 115.64, 159.36 and 100.88 is: 139.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.64 : 159.36 = 100.88 : x
  2. Step 2: Convert to fraction form
    115.64/159.36 = 100.88/x
  3. Step 3: Cross multiply
    115.64x = 159.36 × 100.88
  4. Step 4: Simplify right side
    115.64x = 16,076.24
  5. Step 5: Solve for x
    x = 16,076.24/115.64
  6. Step 6: Final answer
    x = 139.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.