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Finding the Fourth Proportional to 5.85, 7.99 and 5.78

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Solution

The fourth proportional to 5.85, 7.99 and 5.78 is: 7.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.85 : 7.99 = 5.78 : x
  2. Step 2: Convert to fraction form
    5.85/7.99 = 5.78/x
  3. Step 3: Cross multiply
    5.85x = 7.99 × 5.78
  4. Step 4: Simplify right side
    5.85x = 46.19
  5. Step 5: Solve for x
    x = 46.19/5.85
  6. Step 6: Final answer
    x = 7.90

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.