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Finding the Fourth Proportional to 73.90, 101.85 and 57.49

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Solution

The fourth proportional to 73.90, 101.85 and 57.49 is: 79.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.90 : 101.85 = 57.49 : x
  2. Step 2: Convert to fraction form
    73.90/101.85 = 57.49/x
  3. Step 3: Cross multiply
    73.90x = 101.85 × 57.49
  4. Step 4: Simplify right side
    73.90x = 5,855.36
  5. Step 5: Solve for x
    x = 5,855.36/73.90
  6. Step 6: Final answer
    x = 79.23

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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.