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Finding the Fourth Proportional to 892.39, 1,231.50 and 543.08

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Solution

The fourth proportional to 892.39, 1,231.50 and 543.08 is: 749.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.39 : 1,231.50 = 543.08 : x
  2. Step 2: Convert to fraction form
    892.39/1,231.50 = 543.08/x
  3. Step 3: Cross multiply
    892.39x = 1,231.50 × 543.08
  4. Step 4: Simplify right side
    892.39x = 668,803.02
  5. Step 5: Solve for x
    x = 668,803.02/892.39
  6. Step 6: Final answer
    x = 749.45

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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.