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Finding the Fourth Proportional to 816.89, 1,224.06 and 487.19

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Solution

The fourth proportional to 816.89, 1,224.06 and 487.19 is: 730.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.89 : 1,224.06 = 487.19 : x
  2. Step 2: Convert to fraction form
    816.89/1,224.06 = 487.19/x
  3. Step 3: Cross multiply
    816.89x = 1,224.06 × 487.19
  4. Step 4: Simplify right side
    816.89x = 596,349.79
  5. Step 5: Solve for x
    x = 596,349.79/816.89
  6. Step 6: Final answer
    x = 730.02

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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.