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Finding the Fourth Proportional to 51.30, 76.60 and 45.53

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Solution

The fourth proportional to 51.30, 76.60 and 45.53 is: 67.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.30 : 76.60 = 45.53 : x
  2. Step 2: Convert to fraction form
    51.30/76.60 = 45.53/x
  3. Step 3: Cross multiply
    51.30x = 76.60 × 45.53
  4. Step 4: Simplify right side
    51.30x = 3,487.10
  5. Step 5: Solve for x
    x = 3,487.10/51.30
  6. Step 6: Final answer
    x = 67.98

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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.