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Finding the Fourth Proportional to 839.66, 1,258.79 and 656.51

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Solution

The fourth proportional to 839.66, 1,258.79 and 656.51 is: 984.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.66 : 1,258.79 = 656.51 : x
  2. Step 2: Convert to fraction form
    839.66/1,258.79 = 656.51/x
  3. Step 3: Cross multiply
    839.66x = 1,258.79 × 656.51
  4. Step 4: Simplify right side
    839.66x = 826,398.65
  5. Step 5: Solve for x
    x = 826,398.65/839.66
  6. Step 6: Final answer
    x = 984.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.