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Finding the Fourth Proportional to 8.79, 13.16 and 5.40

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Solution

The fourth proportional to 8.79, 13.16 and 5.40 is: 8.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.79 : 13.16 = 5.40 : x
  2. Step 2: Convert to fraction form
    8.79/13.16 = 5.40/x
  3. Step 3: Cross multiply
    8.79x = 13.16 × 5.40
  4. Step 4: Simplify right side
    8.79x = 71.08
  5. Step 5: Solve for x
    x = 71.08/8.79
  6. Step 6: Final answer
    x = 8.09

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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.