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Finding the Fourth Proportional to 899.28, 1,240.92 and 637.92

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Solution

The fourth proportional to 899.28, 1,240.92 and 637.92 is: 880.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.28 : 1,240.92 = 637.92 : x
  2. Step 2: Convert to fraction form
    899.28/1,240.92 = 637.92/x
  3. Step 3: Cross multiply
    899.28x = 1,240.92 × 637.92
  4. Step 4: Simplify right side
    899.28x = 791,607.69
  5. Step 5: Solve for x
    x = 791,607.69/899.28
  6. Step 6: Final answer
    x = 880.27

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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.