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Finding the Fourth Proportional to 290.79, 400.71 and 247.05

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Solution

The fourth proportional to 290.79, 400.71 and 247.05 is: 340.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.79 : 400.71 = 247.05 : x
  2. Step 2: Convert to fraction form
    290.79/400.71 = 247.05/x
  3. Step 3: Cross multiply
    290.79x = 400.71 × 247.05
  4. Step 4: Simplify right side
    290.79x = 98,995.41
  5. Step 5: Solve for x
    x = 98,995.41/290.79
  6. Step 6: Final answer
    x = 340.44

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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.