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Finding the Fourth Proportional to 78.89, 108.74 and 58.13

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Solution

The fourth proportional to 78.89, 108.74 and 58.13 is: 80.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.89 : 108.74 = 58.13 : x
  2. Step 2: Convert to fraction form
    78.89/108.74 = 58.13/x
  3. Step 3: Cross multiply
    78.89x = 108.74 × 58.13
  4. Step 4: Simplify right side
    78.89x = 6,320.22
  5. Step 5: Solve for x
    x = 6,320.22/78.89
  6. Step 6: Final answer
    x = 80.12

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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.