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Finding the Fourth Proportional to 877.55, 1,211.40 and 523.59

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Solution

The fourth proportional to 877.55, 1,211.40 and 523.59 is: 722.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.55 : 1,211.40 = 523.59 : x
  2. Step 2: Convert to fraction form
    877.55/1,211.40 = 523.59/x
  3. Step 3: Cross multiply
    877.55x = 1,211.40 × 523.59
  4. Step 4: Simplify right side
    877.55x = 634,276.93
  5. Step 5: Solve for x
    x = 634,276.93/877.55
  6. Step 6: Final answer
    x = 722.79

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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.