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Finding the Fourth Proportional to 1.25, 1.72 and 0.70

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Solution

The fourth proportional to 1.25, 1.72 and 0.70 is: 0.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.25 : 1.72 = 0.70 : x
  2. Step 2: Convert to fraction form
    1.25/1.72 = 0.70/x
  3. Step 3: Cross multiply
    1.25x = 1.72 × 0.70
  4. Step 4: Simplify right side
    1.25x = 1.21
  5. Step 5: Solve for x
    x = 1.21/1.25
  6. Step 6: Final answer
    x = 0.97

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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.