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Finding the Fourth Proportional to 1,167.12, 1,749 and 619.56

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Solution

The fourth proportional to 1,167.12, 1,749 and 619.56 is: 928.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,167.12 : 1,749 = 619.56 : x
  2. Step 2: Convert to fraction form
    1,167.12/1,749 = 619.56/x
  3. Step 3: Cross multiply
    1,167.12x = 1,749 × 619.56
  4. Step 4: Simplify right side
    1,167.12x = 1,083,610.44
  5. Step 5: Solve for x
    x = 1,083,610.44/1,167.12
  6. Step 6: Final answer
    x = 928.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.