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Finding the Fourth Proportional to 115.77, 159.88 and 99.30

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Solution

The fourth proportional to 115.77, 159.88 and 99.30 is: 137.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.77 : 159.88 = 99.30 : x
  2. Step 2: Convert to fraction form
    115.77/159.88 = 99.30/x
  3. Step 3: Cross multiply
    115.77x = 159.88 × 99.30
  4. Step 4: Simplify right side
    115.77x = 15,875.59
  5. Step 5: Solve for x
    x = 15,875.59/115.77
  6. Step 6: Final answer
    x = 137.13

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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.