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Finding the Fourth Proportional to 72.14, 99.51 and 57.66

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Solution

The fourth proportional to 72.14, 99.51 and 57.66 is: 79.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.14 : 99.51 = 57.66 : x
  2. Step 2: Convert to fraction form
    72.14/99.51 = 57.66/x
  3. Step 3: Cross multiply
    72.14x = 99.51 × 57.66
  4. Step 4: Simplify right side
    72.14x = 5,737.75
  5. Step 5: Solve for x
    x = 5,737.75/72.14
  6. Step 6: Final answer
    x = 79.54

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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.