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Finding the Fourth Proportional to 905.02, 1,248.91 and 491.02

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Solution

The fourth proportional to 905.02, 1,248.91 and 491.02 is: 677.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.02 : 1,248.91 = 491.02 : x
  2. Step 2: Convert to fraction form
    905.02/1,248.91 = 491.02/x
  3. Step 3: Cross multiply
    905.02x = 1,248.91 × 491.02
  4. Step 4: Simplify right side
    905.02x = 613,239.79
  5. Step 5: Solve for x
    x = 613,239.79/905.02
  6. Step 6: Final answer
    x = 677.60

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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.