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Finding the Fourth Proportional to 49.70, 68.61 and 31.29

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Solution

The fourth proportional to 49.70, 68.61 and 31.29 is: 43.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.70 : 68.61 = 31.29 : x
  2. Step 2: Convert to fraction form
    49.70/68.61 = 31.29/x
  3. Step 3: Cross multiply
    49.70x = 68.61 × 31.29
  4. Step 4: Simplify right side
    49.70x = 2,146.51
  5. Step 5: Solve for x
    x = 2,146.51/49.70
  6. Step 6: Final answer
    x = 43.19

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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.