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Finding the Fourth Proportional to 853.50, 1,177.83 and 543.18

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Solution

The fourth proportional to 853.50, 1,177.83 and 543.18 is: 749.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.50 : 1,177.83 = 543.18 : x
  2. Step 2: Convert to fraction form
    853.50/1,177.83 = 543.18/x
  3. Step 3: Cross multiply
    853.50x = 1,177.83 × 543.18
  4. Step 4: Simplify right side
    853.50x = 639,773.70
  5. Step 5: Solve for x
    x = 639,773.70/853.50
  6. Step 6: Final answer
    x = 749.59

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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.