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Finding the Fourth Proportional to 5.79, 8.72 and 4.31

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Solution

The fourth proportional to 5.79, 8.72 and 4.31 is: 6.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.79 : 8.72 = 4.31 : x
  2. Step 2: Convert to fraction form
    5.79/8.72 = 4.31/x
  3. Step 3: Cross multiply
    5.79x = 8.72 × 4.31
  4. Step 4: Simplify right side
    5.79x = 37.52
  5. Step 5: Solve for x
    x = 37.52/5.79
  6. Step 6: Final answer
    x = 6.48

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.