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Finding the Fourth Proportional to 822.88, 1,233.60 and 389.71

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Solution

The fourth proportional to 822.88, 1,233.60 and 389.71 is: 584.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.88 : 1,233.60 = 389.71 : x
  2. Step 2: Convert to fraction form
    822.88/1,233.60 = 389.71/x
  3. Step 3: Cross multiply
    822.88x = 1,233.60 × 389.71
  4. Step 4: Simplify right side
    822.88x = 480,746.26
  5. Step 5: Solve for x
    x = 480,746.26/822.88
  6. Step 6: Final answer
    x = 584.22

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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.