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Finding the Fourth Proportional to 862.99, 1,191.14 and 490.20

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Solution

The fourth proportional to 862.99, 1,191.14 and 490.20 is: 676.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.99 : 1,191.14 = 490.20 : x
  2. Step 2: Convert to fraction form
    862.99/1,191.14 = 490.20/x
  3. Step 3: Cross multiply
    862.99x = 1,191.14 × 490.20
  4. Step 4: Simplify right side
    862.99x = 583,891.75
  5. Step 5: Solve for x
    x = 583,891.75/862.99
  6. Step 6: Final answer
    x = 676.59

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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.