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Finding the Fourth Proportional to 58.72, 80.98 and 57.80

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Solution

The fourth proportional to 58.72, 80.98 and 57.80 is: 79.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.72 : 80.98 = 57.80 : x
  2. Step 2: Convert to fraction form
    58.72/80.98 = 57.80/x
  3. Step 3: Cross multiply
    58.72x = 80.98 × 57.80
  4. Step 4: Simplify right side
    58.72x = 4,680.64
  5. Step 5: Solve for x
    x = 4,680.64/58.72
  6. Step 6: Final answer
    x = 79.71

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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.