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Finding the Fourth Proportional to 53.70, 74.10 and 31.87

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Solution

The fourth proportional to 53.70, 74.10 and 31.87 is: 43.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.70 : 74.10 = 31.87 : x
  2. Step 2: Convert to fraction form
    53.70/74.10 = 31.87/x
  3. Step 3: Cross multiply
    53.70x = 74.10 × 31.87
  4. Step 4: Simplify right side
    53.70x = 2,361.57
  5. Step 5: Solve for x
    x = 2,361.57/53.70
  6. Step 6: Final answer
    x = 43.98

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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.