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Finding the Fourth Proportional to 1,490.16, 2,235.72 and 806

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Solution

The fourth proportional to 1,490.16, 2,235.72 and 806 is: 1,209.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.16 : 2,235.72 = 806 : x
  2. Step 2: Convert to fraction form
    1,490.16/2,235.72 = 806/x
  3. Step 3: Cross multiply
    1,490.16x = 2,235.72 × 806
  4. Step 4: Simplify right side
    1,490.16x = 1,801,990.32
  5. Step 5: Solve for x
    x = 1,801,990.32/1,490.16
  6. Step 6: Final answer
    x = 1,209.26

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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.