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Finding the Fourth Proportional to 390.66, 537.49 and 296.86

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Solution

The fourth proportional to 390.66, 537.49 and 296.86 is: 408.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.66 : 537.49 = 296.86 : x
  2. Step 2: Convert to fraction form
    390.66/537.49 = 296.86/x
  3. Step 3: Cross multiply
    390.66x = 537.49 × 296.86
  4. Step 4: Simplify right side
    390.66x = 159,559.28
  5. Step 5: Solve for x
    x = 159,559.28/390.66
  6. Step 6: Final answer
    x = 408.44

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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.