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Finding the Fourth Proportional to 994.87, 1,492.18 and 378.60

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Solution

The fourth proportional to 994.87, 1,492.18 and 378.60 is: 567.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.87 : 1,492.18 = 378.60 : x
  2. Step 2: Convert to fraction form
    994.87/1,492.18 = 378.60/x
  3. Step 3: Cross multiply
    994.87x = 1,492.18 × 378.60
  4. Step 4: Simplify right side
    994.87x = 564,939.35
  5. Step 5: Solve for x
    x = 564,939.35/994.87
  6. Step 6: Final answer
    x = 567.85

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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.