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Finding the Fourth Proportional to 30.76, 42.34 and 26.60

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Solution

The fourth proportional to 30.76, 42.34 and 26.60 is: 36.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.76 : 42.34 = 26.60 : x
  2. Step 2: Convert to fraction form
    30.76/42.34 = 26.60/x
  3. Step 3: Cross multiply
    30.76x = 42.34 × 26.60
  4. Step 4: Simplify right side
    30.76x = 1,126.24
  5. Step 5: Solve for x
    x = 1,126.24/30.76
  6. Step 6: Final answer
    x = 36.61

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Find fourth proportional to 15.38, 21.17 and 13.30
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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.