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Finding the Fourth Proportional to 10, 14.91 and 9.89

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Solution

The fourth proportional to 10, 14.91 and 9.89 is: 14.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    10 : 14.91 = 9.89 : x
  2. Step 2: Convert to fraction form
    10/14.91 = 9.89/x
  3. Step 3: Cross multiply
    10x = 14.91 × 9.89
  4. Step 4: Simplify right side
    10x = 147.46
  5. Step 5: Solve for x
    x = 147.46/10
  6. Step 6: Final answer
    x = 14.75

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1.5x scale

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.