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Finding the Fourth Proportional to 58.62, 81.39 and 57.15

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Solution

The fourth proportional to 58.62, 81.39 and 57.15 is: 79.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.62 : 81.39 = 57.15 : x
  2. Step 2: Convert to fraction form
    58.62/81.39 = 57.15/x
  3. Step 3: Cross multiply
    58.62x = 81.39 × 57.15
  4. Step 4: Simplify right side
    58.62x = 4,651.44
  5. Step 5: Solve for x
    x = 4,651.44/58.62
  6. Step 6: Final answer
    x = 79.35

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.