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Finding the Fourth Proportional to 77.10, 114.84 and 72.45

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Solution

The fourth proportional to 77.10, 114.84 and 72.45 is: 107.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.10 : 114.84 = 72.45 : x
  2. Step 2: Convert to fraction form
    77.10/114.84 = 72.45/x
  3. Step 3: Cross multiply
    77.10x = 114.84 × 72.45
  4. Step 4: Simplify right side
    77.10x = 8,320.16
  5. Step 5: Solve for x
    x = 8,320.16/77.10
  6. Step 6: Final answer
    x = 107.91

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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.