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Finding the Fourth Proportional to 154.64, 213.36 and 99.28

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Solution

The fourth proportional to 154.64, 213.36 and 99.28 is: 136.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.64 : 213.36 = 99.28 : x
  2. Step 2: Convert to fraction form
    154.64/213.36 = 99.28/x
  3. Step 3: Cross multiply
    154.64x = 213.36 × 99.28
  4. Step 4: Simplify right side
    154.64x = 21,182.91
  5. Step 5: Solve for x
    x = 21,182.91/154.64
  6. Step 6: Final answer
    x = 136.98

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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.