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Finding the Fourth Proportional to 994.20, 1,491.36 and 344.85

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Solution

The fourth proportional to 994.20, 1,491.36 and 344.85 is: 517.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.20 : 1,491.36 = 344.85 : x
  2. Step 2: Convert to fraction form
    994.20/1,491.36 = 344.85/x
  3. Step 3: Cross multiply
    994.20x = 1,491.36 × 344.85
  4. Step 4: Simplify right side
    994.20x = 514,295.50
  5. Step 5: Solve for x
    x = 514,295.50/994.20
  6. Step 6: Final answer
    x = 517.30

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Half scale
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Double scale
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Similar ratio
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1.5x scale

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.