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Finding the Fourth Proportional to 5.29, 7.29 and 5.21

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Solution

The fourth proportional to 5.29, 7.29 and 5.21 is: 7.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.29 : 7.29 = 5.21 : x
  2. Step 2: Convert to fraction form
    5.29/7.29 = 5.21/x
  3. Step 3: Cross multiply
    5.29x = 7.29 × 5.21
  4. Step 4: Simplify right side
    5.29x = 37.98
  5. Step 5: Solve for x
    x = 37.98/5.29
  6. Step 6: Final answer
    x = 7.18

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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.