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Finding the Fourth Proportional to 154.61, 213.27 and 99.40

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Solution

The fourth proportional to 154.61, 213.27 and 99.40 is: 137.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.61 : 213.27 = 99.40 : x
  2. Step 2: Convert to fraction form
    154.61/213.27 = 99.40/x
  3. Step 3: Cross multiply
    154.61x = 213.27 × 99.40
  4. Step 4: Simplify right side
    154.61x = 21,199.55
  5. Step 5: Solve for x
    x = 21,199.55/154.61
  6. Step 6: Final answer
    x = 137.12

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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.