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Finding the Fourth Proportional to 825.48, 1,240.05 and 643.23

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Solution

The fourth proportional to 825.48, 1,240.05 and 643.23 is: 966.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.48 : 1,240.05 = 643.23 : x
  2. Step 2: Convert to fraction form
    825.48/1,240.05 = 643.23/x
  3. Step 3: Cross multiply
    825.48x = 1,240.05 × 643.23
  4. Step 4: Simplify right side
    825.48x = 797,637.36
  5. Step 5: Solve for x
    x = 797,637.36/825.48
  6. Step 6: Final answer
    x = 966.27

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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.