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Finding the Fourth Proportional to 821.85, 1,134.30 and 490.56

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Solution

The fourth proportional to 821.85, 1,134.30 and 490.56 is: 677.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.85 : 1,134.30 = 490.56 : x
  2. Step 2: Convert to fraction form
    821.85/1,134.30 = 490.56/x
  3. Step 3: Cross multiply
    821.85x = 1,134.30 × 490.56
  4. Step 4: Simplify right side
    821.85x = 556,442.21
  5. Step 5: Solve for x
    x = 556,442.21/821.85
  6. Step 6: Final answer
    x = 677.06

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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.