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Finding the Fourth Proportional to 242.92, 364.45 and 78.39

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Solution

The fourth proportional to 242.92, 364.45 and 78.39 is: 117.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.92 : 364.45 = 78.39 : x
  2. Step 2: Convert to fraction form
    242.92/364.45 = 78.39/x
  3. Step 3: Cross multiply
    242.92x = 364.45 × 78.39
  4. Step 4: Simplify right side
    242.92x = 28,570.21
  5. Step 5: Solve for x
    x = 28,570.21/242.92
  6. Step 6: Final answer
    x = 117.61

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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.