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Finding the Fourth Proportional to 96.51, 133.20 and 57.72

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Solution

The fourth proportional to 96.51, 133.20 and 57.72 is: 79.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.51 : 133.20 = 57.72 : x
  2. Step 2: Convert to fraction form
    96.51/133.20 = 57.72/x
  3. Step 3: Cross multiply
    96.51x = 133.20 × 57.72
  4. Step 4: Simplify right side
    96.51x = 7,688.30
  5. Step 5: Solve for x
    x = 7,688.30/96.51
  6. Step 6: Final answer
    x = 79.66

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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.