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Finding the Fourth Proportional to 0.67, 0.91 and 0.64

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Solution

The fourth proportional to 0.67, 0.91 and 0.64 is: 0.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    0.67 : 0.91 = 0.64 : x
  2. Step 2: Convert to fraction form
    0.67/0.91 = 0.64/x
  3. Step 3: Cross multiply
    0.67x = 0.91 × 0.64
  4. Step 4: Simplify right side
    0.67x = 0.58
  5. Step 5: Solve for x
    x = 0.58/0.67
  6. Step 6: Final answer
    x = 0.87

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.