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Finding the Fourth Proportional to 51.71, 71.36 and 31.00

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Solution

The fourth proportional to 51.71, 71.36 and 31.00 is: 42.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.71 : 71.36 = 31.00 : x
  2. Step 2: Convert to fraction form
    51.71/71.36 = 31.00/x
  3. Step 3: Cross multiply
    51.71x = 71.36 × 31.00
  4. Step 4: Simplify right side
    51.71x = 2,211.69
  5. Step 5: Solve for x
    x = 2,211.69/51.71
  6. Step 6: Final answer
    x = 42.77

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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.