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Finding the Fourth Proportional to 5.10, 7.04 and 2.80

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Solution

The fourth proportional to 5.10, 7.04 and 2.80 is: 3.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.10 : 7.04 = 2.80 : x
  2. Step 2: Convert to fraction form
    5.10/7.04 = 2.80/x
  3. Step 3: Cross multiply
    5.10x = 7.04 × 2.80
  4. Step 4: Simplify right side
    5.10x = 19.71
  5. Step 5: Solve for x
    x = 19.71/5.10
  6. Step 6: Final answer
    x = 3.86

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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.