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Finding the Fourth Proportional to 9.77, 14.56 and 9.39

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Solution

The fourth proportional to 9.77, 14.56 and 9.39 is: 13.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.77 : 14.56 = 9.39 : x
  2. Step 2: Convert to fraction form
    9.77/14.56 = 9.39/x
  3. Step 3: Cross multiply
    9.77x = 14.56 × 9.39
  4. Step 4: Simplify right side
    9.77x = 136.72
  5. Step 5: Solve for x
    x = 136.72/9.77
  6. Step 6: Final answer
    x = 13.99

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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.