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Finding the Fourth Proportional to 102.79, 154.18 and 51.53

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Solution

The fourth proportional to 102.79, 154.18 and 51.53 is: 77.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.79 : 154.18 = 51.53 : x
  2. Step 2: Convert to fraction form
    102.79/154.18 = 51.53/x
  3. Step 3: Cross multiply
    102.79x = 154.18 × 51.53
  4. Step 4: Simplify right side
    102.79x = 7,945.06
  5. Step 5: Solve for x
    x = 7,945.06/102.79
  6. Step 6: Final answer
    x = 77.30

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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.