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Finding the Fourth Proportional to 810.41, 1,215.19 and 290.33

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Solution

The fourth proportional to 810.41, 1,215.19 and 290.33 is: 435.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.41 : 1,215.19 = 290.33 : x
  2. Step 2: Convert to fraction form
    810.41/1,215.19 = 290.33/x
  3. Step 3: Cross multiply
    810.41x = 1,215.19 × 290.33
  4. Step 4: Simplify right side
    810.41x = 352,806.11
  5. Step 5: Solve for x
    x = 352,806.11/810.41
  6. Step 6: Final answer
    x = 435.34

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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.