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Finding the Fourth Proportional to 10.42, 15.64 and 5.61

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Solution

The fourth proportional to 10.42, 15.64 and 5.61 is: 8.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.42 : 15.64 = 5.61 : x
  2. Step 2: Convert to fraction form
    10.42/15.64 = 5.61/x
  3. Step 3: Cross multiply
    10.42x = 15.64 × 5.61
  4. Step 4: Simplify right side
    10.42x = 87.70
  5. Step 5: Solve for x
    x = 87.70/10.42
  6. Step 6: Final answer
    x = 8.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.