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Finding the Fourth Proportional to 997.80, 1,490.16 and 835.62

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Solution

The fourth proportional to 997.80, 1,490.16 and 835.62 is: 1,247.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.80 : 1,490.16 = 835.62 : x
  2. Step 2: Convert to fraction form
    997.80/1,490.16 = 835.62/x
  3. Step 3: Cross multiply
    997.80x = 1,490.16 × 835.62
  4. Step 4: Simplify right side
    997.80x = 1,245,207.50
  5. Step 5: Solve for x
    x = 1,245,207.50/997.80
  6. Step 6: Final answer
    x = 1,247.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.