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Finding the Fourth Proportional to 5.25, 7.85 and 3.53

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Solution

The fourth proportional to 5.25, 7.85 and 3.53 is: 5.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.25 : 7.85 = 3.53 : x
  2. Step 2: Convert to fraction form
    5.25/7.85 = 3.53/x
  3. Step 3: Cross multiply
    5.25x = 7.85 × 3.53
  4. Step 4: Simplify right side
    5.25x = 27.71
  5. Step 5: Solve for x
    x = 27.71/5.25
  6. Step 6: Final answer
    x = 5.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.