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Finding the Fourth Proportional to 1,224.55, 1,837.34 and 639.99

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Solution

The fourth proportional to 1,224.55, 1,837.34 and 639.99 is: 960.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.55 : 1,837.34 = 639.99 : x
  2. Step 2: Convert to fraction form
    1,224.55/1,837.34 = 639.99/x
  3. Step 3: Cross multiply
    1,224.55x = 1,837.34 × 639.99
  4. Step 4: Simplify right side
    1,224.55x = 1,175,879.23
  5. Step 5: Solve for x
    x = 1,175,879.23/1,224.55
  6. Step 6: Final answer
    x = 960.25

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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.