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Finding the Fourth Proportional to 899.36, 1,239.84 and 637.28

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Solution

The fourth proportional to 899.36, 1,239.84 and 637.28 is: 878.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.36 : 1,239.84 = 637.28 : x
  2. Step 2: Convert to fraction form
    899.36/1,239.84 = 637.28/x
  3. Step 3: Cross multiply
    899.36x = 1,239.84 × 637.28
  4. Step 4: Simplify right side
    899.36x = 790,125.24
  5. Step 5: Solve for x
    x = 790,125.24/899.36
  6. Step 6: Final answer
    x = 878.54

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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.