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Finding the Fourth Proportional to 839.62, 1,158.87 and 490.51

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Solution

The fourth proportional to 839.62, 1,158.87 and 490.51 is: 677.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.62 : 1,158.87 = 490.51 : x
  2. Step 2: Convert to fraction form
    839.62/1,158.87 = 490.51/x
  3. Step 3: Cross multiply
    839.62x = 1,158.87 × 490.51
  4. Step 4: Simplify right side
    839.62x = 568,437.32
  5. Step 5: Solve for x
    x = 568,437.32/839.62
  6. Step 6: Final answer
    x = 677.02

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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.