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Finding the Fourth Proportional to 75.42, 112.71 and 53.66

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Solution

The fourth proportional to 75.42, 112.71 and 53.66 is: 80.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.42 : 112.71 = 53.66 : x
  2. Step 2: Convert to fraction form
    75.42/112.71 = 53.66/x
  3. Step 3: Cross multiply
    75.42x = 112.71 × 53.66
  4. Step 4: Simplify right side
    75.42x = 6,048.50
  5. Step 5: Solve for x
    x = 6,048.50/75.42
  6. Step 6: Final answer
    x = 80.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.