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Finding the Fourth Proportional to 112.19, 154.80 and 65.55

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Solution

The fourth proportional to 112.19, 154.80 and 65.55 is: 90.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.19 : 154.80 = 65.55 : x
  2. Step 2: Convert to fraction form
    112.19/154.80 = 65.55/x
  3. Step 3: Cross multiply
    112.19x = 154.80 × 65.55
  4. Step 4: Simplify right side
    112.19x = 10,147.14
  5. Step 5: Solve for x
    x = 10,147.14/112.19
  6. Step 6: Final answer
    x = 90.45

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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.