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Finding the Fourth Proportional to 102.24, 153.18 and 99.72

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Solution

The fourth proportional to 102.24, 153.18 and 99.72 is: 149.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.24 : 153.18 = 99.72 : x
  2. Step 2: Convert to fraction form
    102.24/153.18 = 99.72/x
  3. Step 3: Cross multiply
    102.24x = 153.18 × 99.72
  4. Step 4: Simplify right side
    102.24x = 15,275.11
  5. Step 5: Solve for x
    x = 15,275.11/102.24
  6. Step 6: Final answer
    x = 149.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.