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Finding the Fourth Proportional to 5.29, 7.91 and 4.15

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Solution

The fourth proportional to 5.29, 7.91 and 4.15 is: 6.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.29 : 7.91 = 4.15 : x
  2. Step 2: Convert to fraction form
    5.29/7.91 = 4.15/x
  3. Step 3: Cross multiply
    5.29x = 7.91 × 4.15
  4. Step 4: Simplify right side
    5.29x = 32.83
  5. Step 5: Solve for x
    x = 32.83/5.29
  6. Step 6: Final answer
    x = 6.21

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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.