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Finding the Fourth Proportional to 51.71, 71.21 and 49.32

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Solution

The fourth proportional to 51.71, 71.21 and 49.32 is: 67.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.71 : 71.21 = 49.32 : x
  2. Step 2: Convert to fraction form
    51.71/71.21 = 49.32/x
  3. Step 3: Cross multiply
    51.71x = 71.21 × 49.32
  4. Step 4: Simplify right side
    51.71x = 3,511.83
  5. Step 5: Solve for x
    x = 3,511.83/51.71
  6. Step 6: Final answer
    x = 67.92

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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.