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Finding the Fourth Proportional to 78.68, 118.02 and 77.33

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Solution

The fourth proportional to 78.68, 118.02 and 77.33 is: 116.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.68 : 118.02 = 77.33 : x
  2. Step 2: Convert to fraction form
    78.68/118.02 = 77.33/x
  3. Step 3: Cross multiply
    78.68x = 118.02 × 77.33
  4. Step 4: Simplify right side
    78.68x = 9,126.49
  5. Step 5: Solve for x
    x = 9,126.49/78.68
  6. Step 6: Final answer
    x = 116.00

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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.