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Finding the Fourth Proportional to 51.57, 71.28 and 40.64

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Solution

The fourth proportional to 51.57, 71.28 and 40.64 is: 56.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.57 : 71.28 = 40.64 : x
  2. Step 2: Convert to fraction form
    51.57/71.28 = 40.64/x
  3. Step 3: Cross multiply
    51.57x = 71.28 × 40.64
  4. Step 4: Simplify right side
    51.57x = 2,896.46
  5. Step 5: Solve for x
    x = 2,896.46/51.57
  6. Step 6: Final answer
    x = 56.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.