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Finding the Fourth Proportional to 839.76, 1,158.88 and 490.45

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Solution

The fourth proportional to 839.76, 1,158.88 and 490.45 is: 676.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.76 : 1,158.88 = 490.45 : x
  2. Step 2: Convert to fraction form
    839.76/1,158.88 = 490.45/x
  3. Step 3: Cross multiply
    839.76x = 1,158.88 × 490.45
  4. Step 4: Simplify right side
    839.76x = 568,372.70
  5. Step 5: Solve for x
    x = 568,372.70/839.76
  6. Step 6: Final answer
    x = 676.83

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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.