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Finding the Fourth Proportional to 1.28, 1.76 and 0.89

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Solution

The fourth proportional to 1.28, 1.76 and 0.89 is: 1.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.28 : 1.76 = 0.89 : x
  2. Step 2: Convert to fraction form
    1.28/1.76 = 0.89/x
  3. Step 3: Cross multiply
    1.28x = 1.76 × 0.89
  4. Step 4: Simplify right side
    1.28x = 1.58
  5. Step 5: Solve for x
    x = 1.58/1.28
  6. Step 6: Final answer
    x = 1.23

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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.