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Finding the Fourth Proportional to 49.51, 74.31 and 42.76

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Solution

The fourth proportional to 49.51, 74.31 and 42.76 is: 64.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.51 : 74.31 = 42.76 : x
  2. Step 2: Convert to fraction form
    49.51/74.31 = 42.76/x
  3. Step 3: Cross multiply
    49.51x = 74.31 × 42.76
  4. Step 4: Simplify right side
    49.51x = 3,177.50
  5. Step 5: Solve for x
    x = 3,177.50/49.51
  6. Step 6: Final answer
    x = 64.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.