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Finding the Fourth Proportional to 836.40, 1,253.52 and 548.04

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Solution

The fourth proportional to 836.40, 1,253.52 and 548.04 is: 821.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.40 : 1,253.52 = 548.04 : x
  2. Step 2: Convert to fraction form
    836.40/1,253.52 = 548.04/x
  3. Step 3: Cross multiply
    836.40x = 1,253.52 × 548.04
  4. Step 4: Simplify right side
    836.40x = 686,979.10
  5. Step 5: Solve for x
    x = 686,979.10/836.40
  6. Step 6: Final answer
    x = 821.35

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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.