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Finding the Fourth Proportional to 58.62, 87.21 and 57.42

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Solution

The fourth proportional to 58.62, 87.21 and 57.42 is: 85.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.62 : 87.21 = 57.42 : x
  2. Step 2: Convert to fraction form
    58.62/87.21 = 57.42/x
  3. Step 3: Cross multiply
    58.62x = 87.21 × 57.42
  4. Step 4: Simplify right side
    58.62x = 5,007.60
  5. Step 5: Solve for x
    x = 5,007.60/58.62
  6. Step 6: Final answer
    x = 85.42

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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.