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Finding the Fourth Proportional to 10.15, 14.00 and 5.78

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Solution

The fourth proportional to 10.15, 14.00 and 5.78 is: 7.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.15 : 14.00 = 5.78 : x
  2. Step 2: Convert to fraction form
    10.15/14.00 = 5.78/x
  3. Step 3: Cross multiply
    10.15x = 14.00 × 5.78
  4. Step 4: Simplify right side
    10.15x = 80.87
  5. Step 5: Solve for x
    x = 80.87/10.15
  6. Step 6: Final answer
    x = 7.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.