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Finding the Fourth Proportional to 153.18, 228.11 and 149.40

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Solution

The fourth proportional to 153.18, 228.11 and 149.40 is: 222.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.18 : 228.11 = 149.40 : x
  2. Step 2: Convert to fraction form
    153.18/228.11 = 149.40/x
  3. Step 3: Cross multiply
    153.18x = 228.11 × 149.40
  4. Step 4: Simplify right side
    153.18x = 34,079.63
  5. Step 5: Solve for x
    x = 34,079.63/153.18
  6. Step 6: Final answer
    x = 222.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.