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Finding the Fourth Proportional to 5.39, 8.03 and 5.20

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Solution

The fourth proportional to 5.39, 8.03 and 5.20 is: 7.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.39 : 8.03 = 5.20 : x
  2. Step 2: Convert to fraction form
    5.39/8.03 = 5.20/x
  3. Step 3: Cross multiply
    5.39x = 8.03 × 5.20
  4. Step 4: Simplify right side
    5.39x = 41.76
  5. Step 5: Solve for x
    x = 41.76/5.39
  6. Step 6: Final answer
    x = 7.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.