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Finding the Fourth Proportional to 877.61, 1,211.24 and 642.33

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Solution

The fourth proportional to 877.61, 1,211.24 and 642.33 is: 886.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.61 : 1,211.24 = 642.33 : x
  2. Step 2: Convert to fraction form
    877.61/1,211.24 = 642.33/x
  3. Step 3: Cross multiply
    877.61x = 1,211.24 × 642.33
  4. Step 4: Simplify right side
    877.61x = 778,012.58
  5. Step 5: Solve for x
    x = 778,012.58/877.61
  6. Step 6: Final answer
    x = 886.52

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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.