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Finding the Fourth Proportional to 77.12, 116.30 and 70.64

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Solution

The fourth proportional to 77.12, 116.30 and 70.64 is: 106.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.12 : 116.30 = 70.64 : x
  2. Step 2: Convert to fraction form
    77.12/116.30 = 70.64/x
  3. Step 3: Cross multiply
    77.12x = 116.30 × 70.64
  4. Step 4: Simplify right side
    77.12x = 8,215.43
  5. Step 5: Solve for x
    x = 8,215.43/77.12
  6. Step 6: Final answer
    x = 106.53

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.