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Finding the Fourth Proportional to 78.33, 108.07 and 45.12

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Solution

The fourth proportional to 78.33, 108.07 and 45.12 is: 62.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.33 : 108.07 = 45.12 : x
  2. Step 2: Convert to fraction form
    78.33/108.07 = 45.12/x
  3. Step 3: Cross multiply
    78.33x = 108.07 × 45.12
  4. Step 4: Simplify right side
    78.33x = 4,876.12
  5. Step 5: Solve for x
    x = 4,876.12/78.33
  6. Step 6: Final answer
    x = 62.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.