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Finding the Fourth Proportional to 57.51, 79.40 and 38.87

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Solution

The fourth proportional to 57.51, 79.40 and 38.87 is: 53.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.51 : 79.40 = 38.87 : x
  2. Step 2: Convert to fraction form
    57.51/79.40 = 38.87/x
  3. Step 3: Cross multiply
    57.51x = 79.40 × 38.87
  4. Step 4: Simplify right side
    57.51x = 3,085.69
  5. Step 5: Solve for x
    x = 3,085.69/57.51
  6. Step 6: Final answer
    x = 53.65

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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.