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Finding the Fourth Proportional to 836.48, 1,254.78 and 259.28

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Solution

The fourth proportional to 836.48, 1,254.78 and 259.28 is: 388.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.48 : 1,254.78 = 259.28 : x
  2. Step 2: Convert to fraction form
    836.48/1,254.78 = 259.28/x
  3. Step 3: Cross multiply
    836.48x = 1,254.78 × 259.28
  4. Step 4: Simplify right side
    836.48x = 325,339.36
  5. Step 5: Solve for x
    x = 325,339.36/836.48
  6. Step 6: Final answer
    x = 388.94

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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.