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Finding the Fourth Proportional to 899.10, 1,240.75 and 506.25

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Solution

The fourth proportional to 899.10, 1,240.75 and 506.25 is: 698.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.10 : 1,240.75 = 506.25 : x
  2. Step 2: Convert to fraction form
    899.10/1,240.75 = 506.25/x
  3. Step 3: Cross multiply
    899.10x = 1,240.75 × 506.25
  4. Step 4: Simplify right side
    899.10x = 628,123.48
  5. Step 5: Solve for x
    x = 628,123.48/899.10
  6. Step 6: Final answer
    x = 698.62

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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.