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Finding the Fourth Proportional to 810.90, 1,216.74 and 324.36

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Solution

The fourth proportional to 810.90, 1,216.74 and 324.36 is: 486.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.90 : 1,216.74 = 324.36 : x
  2. Step 2: Convert to fraction form
    810.90/1,216.74 = 324.36/x
  3. Step 3: Cross multiply
    810.90x = 1,216.74 × 324.36
  4. Step 4: Simplify right side
    810.90x = 394,661.79
  5. Step 5: Solve for x
    x = 394,661.79/810.90
  6. Step 6: Final answer
    x = 486.70

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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.