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Finding the Fourth Proportional to 58.16, 80.34 and 57.76

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Solution

The fourth proportional to 58.16, 80.34 and 57.76 is: 79.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.16 : 80.34 = 57.76 : x
  2. Step 2: Convert to fraction form
    58.16/80.34 = 57.76/x
  3. Step 3: Cross multiply
    58.16x = 80.34 × 57.76
  4. Step 4: Simplify right side
    58.16x = 4,640.04
  5. Step 5: Solve for x
    x = 4,640.04/58.16
  6. Step 6: Final answer
    x = 79.78

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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.