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Finding the Fourth Proportional to 9.72, 14.51 and 8.78

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Solution

The fourth proportional to 9.72, 14.51 and 8.78 is: 13.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.72 : 14.51 = 8.78 : x
  2. Step 2: Convert to fraction form
    9.72/14.51 = 8.78/x
  3. Step 3: Cross multiply
    9.72x = 14.51 × 8.78
  4. Step 4: Simplify right side
    9.72x = 127.35
  5. Step 5: Solve for x
    x = 127.35/9.72
  6. Step 6: Final answer
    x = 13.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.