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Finding the Fourth Proportional to 877.32, 1,211.22 and 567.72

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Solution

The fourth proportional to 877.32, 1,211.22 and 567.72 is: 783.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.32 : 1,211.22 = 567.72 : x
  2. Step 2: Convert to fraction form
    877.32/1,211.22 = 567.72/x
  3. Step 3: Cross multiply
    877.32x = 1,211.22 × 567.72
  4. Step 4: Simplify right side
    877.32x = 687,633.82
  5. Step 5: Solve for x
    x = 687,633.82/877.32
  6. Step 6: Final answer
    x = 783.79

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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.