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Finding the Fourth Proportional to 326.66, 487.47 and 290.30

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Solution

The fourth proportional to 326.66, 487.47 and 290.30 is: 433.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.66 : 487.47 = 290.30 : x
  2. Step 2: Convert to fraction form
    326.66/487.47 = 290.30/x
  3. Step 3: Cross multiply
    326.66x = 487.47 × 290.30
  4. Step 4: Simplify right side
    326.66x = 141,511.09
  5. Step 5: Solve for x
    x = 141,511.09/326.66
  6. Step 6: Final answer
    x = 433.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.