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Finding the Fourth Proportional to 1.18, 1.63 and 0.64

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Solution

The fourth proportional to 1.18, 1.63 and 0.64 is: 0.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.18 : 1.63 = 0.64 : x
  2. Step 2: Convert to fraction form
    1.18/1.63 = 0.64/x
  3. Step 3: Cross multiply
    1.18x = 1.63 × 0.64
  4. Step 4: Simplify right side
    1.18x = 1.05
  5. Step 5: Solve for x
    x = 1.05/1.18
  6. Step 6: Final answer
    x = 0.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.