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Finding the Fourth Proportional to 0.72, 1.09 and 0.61

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Solution

The fourth proportional to 0.72, 1.09 and 0.61 is: 0.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    0.72 : 1.09 = 0.61 : x
  2. Step 2: Convert to fraction form
    0.72/1.09 = 0.61/x
  3. Step 3: Cross multiply
    0.72x = 1.09 × 0.61
  4. Step 4: Simplify right side
    0.72x = 0.66
  5. Step 5: Solve for x
    x = 0.66/0.72
  6. Step 6: Final answer
    x = 0.92

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.