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Finding the Fourth Proportional to 153.36, 212.76 and 149.76

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Solution

The fourth proportional to 153.36, 212.76 and 149.76 is: 207.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.36 : 212.76 = 149.76 : x
  2. Step 2: Convert to fraction form
    153.36/212.76 = 149.76/x
  3. Step 3: Cross multiply
    153.36x = 212.76 × 149.76
  4. Step 4: Simplify right side
    153.36x = 31,862.94
  5. Step 5: Solve for x
    x = 31,862.94/153.36
  6. Step 6: Final answer
    x = 207.77

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.