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Finding the Fourth Proportional to 70.30, 105.49 and 61.34

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Solution

The fourth proportional to 70.30, 105.49 and 61.34 is: 92.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.30 : 105.49 = 61.34 : x
  2. Step 2: Convert to fraction form
    70.30/105.49 = 61.34/x
  3. Step 3: Cross multiply
    70.30x = 105.49 × 61.34
  4. Step 4: Simplify right side
    70.30x = 6,470.76
  5. Step 5: Solve for x
    x = 6,470.76/70.30
  6. Step 6: Final answer
    x = 92.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.