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Finding the Fourth Proportional to 70.79, 106.16 and 30.20

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Solution

The fourth proportional to 70.79, 106.16 and 30.20 is: 45.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.79 : 106.16 = 30.20 : x
  2. Step 2: Convert to fraction form
    70.79/106.16 = 30.20/x
  3. Step 3: Cross multiply
    70.79x = 106.16 × 30.20
  4. Step 4: Simplify right side
    70.79x = 3,205.35
  5. Step 5: Solve for x
    x = 3,205.35/70.79
  6. Step 6: Final answer
    x = 45.28

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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.