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Finding the Fourth Proportional to 836.40, 1,252.20 and 740.40

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Solution

The fourth proportional to 836.40, 1,252.20 and 740.40 is: 1,108.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.40 : 1,252.20 = 740.40 : x
  2. Step 2: Convert to fraction form
    836.40/1,252.20 = 740.40/x
  3. Step 3: Cross multiply
    836.40x = 1,252.20 × 740.40
  4. Step 4: Simplify right side
    836.40x = 927,128.88
  5. Step 5: Solve for x
    x = 927,128.88/836.40
  6. Step 6: Final answer
    x = 1,108.48

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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.