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Finding the Fourth Proportional to 77.86, 116.65 and 48.93

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Solution

The fourth proportional to 77.86, 116.65 and 48.93 is: 73.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.86 : 116.65 = 48.93 : x
  2. Step 2: Convert to fraction form
    77.86/116.65 = 48.93/x
  3. Step 3: Cross multiply
    77.86x = 116.65 × 48.93
  4. Step 4: Simplify right side
    77.86x = 5,707.71
  5. Step 5: Solve for x
    x = 5,707.71/77.86
  6. Step 6: Final answer
    x = 73.31

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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.