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Finding the Fourth Proportional to 839.98, 1,159.26 and 490.66

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Solution

The fourth proportional to 839.98, 1,159.26 and 490.66 is: 677.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.98 : 1,159.26 = 490.66 : x
  2. Step 2: Convert to fraction form
    839.98/1,159.26 = 490.66/x
  3. Step 3: Cross multiply
    839.98x = 1,159.26 × 490.66
  4. Step 4: Simplify right side
    839.98x = 568,802.51
  5. Step 5: Solve for x
    x = 568,802.51/839.98
  6. Step 6: Final answer
    x = 677.16

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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.