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Finding the Fourth Proportional to 816.30, 1,221.40 and 502.82

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Solution

The fourth proportional to 816.30, 1,221.40 and 502.82 is: 752.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.30 : 1,221.40 = 502.82 : x
  2. Step 2: Convert to fraction form
    816.30/1,221.40 = 502.82/x
  3. Step 3: Cross multiply
    816.30x = 1,221.40 × 502.82
  4. Step 4: Simplify right side
    816.30x = 614,144.35
  5. Step 5: Solve for x
    x = 614,144.35/816.30
  6. Step 6: Final answer
    x = 752.35

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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.