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Finding the Fourth Proportional to 77.90, 116.31 and 70.22

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Solution

The fourth proportional to 77.90, 116.31 and 70.22 is: 104.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.90 : 116.31 = 70.22 : x
  2. Step 2: Convert to fraction form
    77.90/116.31 = 70.22/x
  3. Step 3: Cross multiply
    77.90x = 116.31 × 70.22
  4. Step 4: Simplify right side
    77.90x = 8,167.29
  5. Step 5: Solve for x
    x = 8,167.29/77.90
  6. Step 6: Final answer
    x = 104.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.