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Finding the Fourth Proportional to 58.78, 87.62 and 58.21

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Solution

The fourth proportional to 58.78, 87.62 and 58.21 is: 86.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.78 : 87.62 = 58.21 : x
  2. Step 2: Convert to fraction form
    58.78/87.62 = 58.21/x
  3. Step 3: Cross multiply
    58.78x = 87.62 × 58.21
  4. Step 4: Simplify right side
    58.78x = 5,099.85
  5. Step 5: Solve for x
    x = 5,099.85/58.78
  6. Step 6: Final answer
    x = 86.76

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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.