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Finding the Fourth Proportional to 877.73, 1,211.27 and 479.40

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Solution

The fourth proportional to 877.73, 1,211.27 and 479.40 is: 661.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.73 : 1,211.27 = 479.40 : x
  2. Step 2: Convert to fraction form
    877.73/1,211.27 = 479.40/x
  3. Step 3: Cross multiply
    877.73x = 1,211.27 × 479.40
  4. Step 4: Simplify right side
    877.73x = 580,680.44
  5. Step 5: Solve for x
    x = 580,680.44/877.73
  6. Step 6: Final answer
    x = 661.57

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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.