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Finding the Fourth Proportional to 77.58, 107.13 and 55.86

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Solution

The fourth proportional to 77.58, 107.13 and 55.86 is: 77.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.58 : 107.13 = 55.86 : x
  2. Step 2: Convert to fraction form
    77.58/107.13 = 55.86/x
  3. Step 3: Cross multiply
    77.58x = 107.13 × 55.86
  4. Step 4: Simplify right side
    77.58x = 5,984.28
  5. Step 5: Solve for x
    x = 5,984.28/77.58
  6. Step 6: Final answer
    x = 77.14

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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.