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Finding the Fourth Proportional to 111.64, 153.76 and 90.84

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Solution

The fourth proportional to 111.64, 153.76 and 90.84 is: 125.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.64 : 153.76 = 90.84 : x
  2. Step 2: Convert to fraction form
    111.64/153.76 = 90.84/x
  3. Step 3: Cross multiply
    111.64x = 153.76 × 90.84
  4. Step 4: Simplify right side
    111.64x = 13,967.56
  5. Step 5: Solve for x
    x = 13,967.56/111.64
  6. Step 6: Final answer
    x = 125.11

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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.