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Finding the Fourth Proportional to 872.23, 1,203.72 and 479.26

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Solution

The fourth proportional to 872.23, 1,203.72 and 479.26 is: 661.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.23 : 1,203.72 = 479.26 : x
  2. Step 2: Convert to fraction form
    872.23/1,203.72 = 479.26/x
  3. Step 3: Cross multiply
    872.23x = 1,203.72 × 479.26
  4. Step 4: Simplify right side
    872.23x = 576,895.90
  5. Step 5: Solve for x
    x = 576,895.90/872.23
  6. Step 6: Final answer
    x = 661.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.