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Finding the Fourth Proportional to 67.91, 93.69 and 51.56

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Solution

The fourth proportional to 67.91, 93.69 and 51.56 is: 71.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.91 : 93.69 = 51.56 : x
  2. Step 2: Convert to fraction form
    67.91/93.69 = 51.56/x
  3. Step 3: Cross multiply
    67.91x = 93.69 × 51.56
  4. Step 4: Simplify right side
    67.91x = 4,830.19
  5. Step 5: Solve for x
    x = 4,830.19/67.91
  6. Step 6: Final answer
    x = 71.13

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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.