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Finding the Fourth Proportional to 1,166.28, 1,609.50 and 642.30

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Solution

The fourth proportional to 1,166.28, 1,609.50 and 642.30 is: 886.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,166.28 : 1,609.50 = 642.30 : x
  2. Step 2: Convert to fraction form
    1,166.28/1,609.50 = 642.30/x
  3. Step 3: Cross multiply
    1,166.28x = 1,609.50 × 642.30
  4. Step 4: Simplify right side
    1,166.28x = 1,033,781.85
  5. Step 5: Solve for x
    x = 1,033,781.85/1,166.28
  6. Step 6: Final answer
    x = 886.39

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1.5x scale

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.