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Finding the Fourth Proportional to 114.77, 171.78 and 71.48

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Solution

The fourth proportional to 114.77, 171.78 and 71.48 is: 106.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.77 : 171.78 = 71.48 : x
  2. Step 2: Convert to fraction form
    114.77/171.78 = 71.48/x
  3. Step 3: Cross multiply
    114.77x = 171.78 × 71.48
  4. Step 4: Simplify right side
    114.77x = 12,278.19
  5. Step 5: Solve for x
    x = 12,278.19/114.77
  6. Step 6: Final answer
    x = 106.98

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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.