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Finding the Fourth Proportional to 1,765.52, 2,648.58 and 611

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Solution

The fourth proportional to 1,765.52, 2,648.58 and 611 is: 916.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,765.52 : 2,648.58 = 611 : x
  2. Step 2: Convert to fraction form
    1,765.52/2,648.58 = 611/x
  3. Step 3: Cross multiply
    1,765.52x = 2,648.58 × 611
  4. Step 4: Simplify right side
    1,765.52x = 1,618,282.38
  5. Step 5: Solve for x
    x = 1,618,282.38/1,765.52
  6. Step 6: Final answer
    x = 916.60

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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.