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Finding the Fourth Proportional to 57.99, 86.58 and 49.89

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Solution

The fourth proportional to 57.99, 86.58 and 49.89 is: 74.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.99 : 86.58 = 49.89 : x
  2. Step 2: Convert to fraction form
    57.99/86.58 = 49.89/x
  3. Step 3: Cross multiply
    57.99x = 86.58 × 49.89
  4. Step 4: Simplify right side
    57.99x = 4,319.48
  5. Step 5: Solve for x
    x = 4,319.48/57.99
  6. Step 6: Final answer
    x = 74.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.