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Finding the Fourth Proportional to 31.17, 46.47 and 26.85

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Solution

The fourth proportional to 31.17, 46.47 and 26.85 is: 40.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.17 : 46.47 = 26.85 : x
  2. Step 2: Convert to fraction form
    31.17/46.47 = 26.85/x
  3. Step 3: Cross multiply
    31.17x = 46.47 × 26.85
  4. Step 4: Simplify right side
    31.17x = 1,247.72
  5. Step 5: Solve for x
    x = 1,247.72/31.17
  6. Step 6: Final answer
    x = 40.03

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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.