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Finding the Fourth Proportional to 1.05, 1.45 and 0.69

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Solution

The fourth proportional to 1.05, 1.45 and 0.69 is: 0.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.05 : 1.45 = 0.69 : x
  2. Step 2: Convert to fraction form
    1.05/1.45 = 0.69/x
  3. Step 3: Cross multiply
    1.05x = 1.45 × 0.69
  4. Step 4: Simplify right side
    1.05x = 0.99
  5. Step 5: Solve for x
    x = 0.99/1.05
  6. Step 6: Final answer
    x = 0.95

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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.