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Finding the Fourth Proportional to 877.72, 1,211.23 and 479.38

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Solution

The fourth proportional to 877.72, 1,211.23 and 479.38 is: 661.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.72 : 1,211.23 = 479.38 : x
  2. Step 2: Convert to fraction form
    877.72/1,211.23 = 479.38/x
  3. Step 3: Cross multiply
    877.72x = 1,211.23 × 479.38
  4. Step 4: Simplify right side
    877.72x = 580,639.44
  5. Step 5: Solve for x
    x = 580,639.44/877.72
  6. Step 6: Final answer
    x = 661.53

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1.5x scale

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.