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Finding the Fourth Proportional to 678.26, 1,017.83 and 370.31

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Solution

The fourth proportional to 678.26, 1,017.83 and 370.31 is: 555.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.26 : 1,017.83 = 370.31 : x
  2. Step 2: Convert to fraction form
    678.26/1,017.83 = 370.31/x
  3. Step 3: Cross multiply
    678.26x = 1,017.83 × 370.31
  4. Step 4: Simplify right side
    678.26x = 376,913.32
  5. Step 5: Solve for x
    x = 376,913.32/678.26
  6. Step 6: Final answer
    x = 555.70

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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.