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Finding the Fourth Proportional to 1.23, 1.70 and 0.70

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Solution

The fourth proportional to 1.23, 1.70 and 0.70 is: 0.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.23 : 1.70 = 0.70 : x
  2. Step 2: Convert to fraction form
    1.23/1.70 = 0.70/x
  3. Step 3: Cross multiply
    1.23x = 1.70 × 0.70
  4. Step 4: Simplify right side
    1.23x = 1.19
  5. Step 5: Solve for x
    x = 1.19/1.23
  6. Step 6: Final answer
    x = 0.96

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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.