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Finding the Fourth Proportional to 8.55, 11.78 and 5.31

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Solution

The fourth proportional to 8.55, 11.78 and 5.31 is: 7.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.55 : 11.78 = 5.31 : x
  2. Step 2: Convert to fraction form
    8.55/11.78 = 5.31/x
  3. Step 3: Cross multiply
    8.55x = 11.78 × 5.31
  4. Step 4: Simplify right side
    8.55x = 62.55
  5. Step 5: Solve for x
    x = 62.55/8.55
  6. Step 6: Final answer
    x = 7.32

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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.