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Finding the Fourth Proportional to 825.30, 1,137.09 and 678.42

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Solution

The fourth proportional to 825.30, 1,137.09 and 678.42 is: 934.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.30 : 1,137.09 = 678.42 : x
  2. Step 2: Convert to fraction form
    825.30/1,137.09 = 678.42/x
  3. Step 3: Cross multiply
    825.30x = 1,137.09 × 678.42
  4. Step 4: Simplify right side
    825.30x = 771,424.60
  5. Step 5: Solve for x
    x = 771,424.60/825.30
  6. Step 6: Final answer
    x = 934.72

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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.