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Finding the Fourth Proportional to 9.34, 12.89 and 5.70

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Solution

The fourth proportional to 9.34, 12.89 and 5.70 is: 7.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.34 : 12.89 = 5.70 : x
  2. Step 2: Convert to fraction form
    9.34/12.89 = 5.70/x
  3. Step 3: Cross multiply
    9.34x = 12.89 × 5.70
  4. Step 4: Simplify right side
    9.34x = 73.47
  5. Step 5: Solve for x
    x = 73.47/9.34
  6. Step 6: Final answer
    x = 7.86

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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.