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Finding the Fourth Proportional to 356.40, 491.27 and 290.79

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Solution

The fourth proportional to 356.40, 491.27 and 290.79 is: 400.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.40 : 491.27 = 290.79 : x
  2. Step 2: Convert to fraction form
    356.40/491.27 = 290.79/x
  3. Step 3: Cross multiply
    356.40x = 491.27 × 290.79
  4. Step 4: Simplify right side
    356.40x = 142,854.95
  5. Step 5: Solve for x
    x = 142,854.95/356.40
  6. Step 6: Final answer
    x = 400.83

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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.