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Finding the Fourth Proportional to 51.38, 77.35 and 40.02

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Solution

The fourth proportional to 51.38, 77.35 and 40.02 is: 60.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.38 : 77.35 = 40.02 : x
  2. Step 2: Convert to fraction form
    51.38/77.35 = 40.02/x
  3. Step 3: Cross multiply
    51.38x = 77.35 × 40.02
  4. Step 4: Simplify right side
    51.38x = 3,095.55
  5. Step 5: Solve for x
    x = 3,095.55/51.38
  6. Step 6: Final answer
    x = 60.25

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.