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Finding the Fourth Proportional to 888.36, 1,224.44 and 639.30

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Solution

The fourth proportional to 888.36, 1,224.44 and 639.30 is: 881.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.36 : 1,224.44 = 639.30 : x
  2. Step 2: Convert to fraction form
    888.36/1,224.44 = 639.30/x
  3. Step 3: Cross multiply
    888.36x = 1,224.44 × 639.30
  4. Step 4: Simplify right side
    888.36x = 782,784.49
  5. Step 5: Solve for x
    x = 782,784.49/888.36
  6. Step 6: Final answer
    x = 881.16

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1.5x scale

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.