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Finding the Fourth Proportional to 102.76, 153.33 and 85.64

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Solution

The fourth proportional to 102.76, 153.33 and 85.64 is: 127.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.76 : 153.33 = 85.64 : x
  2. Step 2: Convert to fraction form
    102.76/153.33 = 85.64/x
  3. Step 3: Cross multiply
    102.76x = 153.33 × 85.64
  4. Step 4: Simplify right side
    102.76x = 13,131.18
  5. Step 5: Solve for x
    x = 13,131.18/102.76
  6. Step 6: Final answer
    x = 127.78

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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.