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Finding the Fourth Proportional to 899.14, 1,240.80 and 506.15

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Solution

The fourth proportional to 899.14, 1,240.80 and 506.15 is: 698.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.14 : 1,240.80 = 506.15 : x
  2. Step 2: Convert to fraction form
    899.14/1,240.80 = 506.15/x
  3. Step 3: Cross multiply
    899.14x = 1,240.80 × 506.15
  4. Step 4: Simplify right side
    899.14x = 628,030.92
  5. Step 5: Solve for x
    x = 628,030.92/899.14
  6. Step 6: Final answer
    x = 698.48

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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.