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Finding the Fourth Proportional to 899.29, 1,240.99 and 506.31

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Solution

The fourth proportional to 899.29, 1,240.99 and 506.31 is: 698.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.29 : 1,240.99 = 506.31 : x
  2. Step 2: Convert to fraction form
    899.29/1,240.99 = 506.31/x
  3. Step 3: Cross multiply
    899.29x = 1,240.99 × 506.31
  4. Step 4: Simplify right side
    899.29x = 628,325.65
  5. Step 5: Solve for x
    x = 628,325.65/899.29
  6. Step 6: Final answer
    x = 698.69

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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.