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Finding the Fourth Proportional to 77.86, 116.70 and 26.48

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Solution

The fourth proportional to 77.86, 116.70 and 26.48 is: 39.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.86 : 116.70 = 26.48 : x
  2. Step 2: Convert to fraction form
    77.86/116.70 = 26.48/x
  3. Step 3: Cross multiply
    77.86x = 116.70 × 26.48
  4. Step 4: Simplify right side
    77.86x = 3,089.63
  5. Step 5: Solve for x
    x = 3,089.63/77.86
  6. Step 6: Final answer
    x = 39.68

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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.