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Finding the Fourth Proportional to 58.08, 86.90 and 51.38

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Solution

The fourth proportional to 58.08, 86.90 and 51.38 is: 76.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.08 : 86.90 = 51.38 : x
  2. Step 2: Convert to fraction form
    58.08/86.90 = 51.38/x
  3. Step 3: Cross multiply
    58.08x = 86.90 × 51.38
  4. Step 4: Simplify right side
    58.08x = 4,464.92
  5. Step 5: Solve for x
    x = 4,464.92/58.08
  6. Step 6: Final answer
    x = 76.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.