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Finding the Fourth Proportional to 839.54, 1,158.57 and 490.40

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Solution

The fourth proportional to 839.54, 1,158.57 and 490.40 is: 676.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.54 : 1,158.57 = 490.40 : x
  2. Step 2: Convert to fraction form
    839.54/1,158.57 = 490.40/x
  3. Step 3: Cross multiply
    839.54x = 1,158.57 × 490.40
  4. Step 4: Simplify right side
    839.54x = 568,162.73
  5. Step 5: Solve for x
    x = 568,162.73/839.54
  6. Step 6: Final answer
    x = 676.75

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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.