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Finding the Fourth Proportional to 70.77, 97.67 and 39.69

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Solution

The fourth proportional to 70.77, 97.67 and 39.69 is: 54.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.77 : 97.67 = 39.69 : x
  2. Step 2: Convert to fraction form
    70.77/97.67 = 39.69/x
  3. Step 3: Cross multiply
    70.77x = 97.67 × 39.69
  4. Step 4: Simplify right side
    70.77x = 3,875.84
  5. Step 5: Solve for x
    x = 3,875.84/70.77
  6. Step 6: Final answer
    x = 54.77

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Find fourth proportional to 35.38, 48.83 and 19.84
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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.