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Finding the Fourth Proportional to 10.55, 15.71 and 9.93

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Solution

The fourth proportional to 10.55, 15.71 and 9.93 is: 14.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.55 : 15.71 = 9.93 : x
  2. Step 2: Convert to fraction form
    10.55/15.71 = 9.93/x
  3. Step 3: Cross multiply
    10.55x = 15.71 × 9.93
  4. Step 4: Simplify right side
    10.55x = 155.93
  5. Step 5: Solve for x
    x = 155.93/10.55
  6. Step 6: Final answer
    x = 14.78

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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.