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Finding the Fourth Proportional to 840.12, 1,259.92 and 352.92

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Solution

The fourth proportional to 840.12, 1,259.92 and 352.92 is: 529.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.12 : 1,259.92 = 352.92 : x
  2. Step 2: Convert to fraction form
    840.12/1,259.92 = 352.92/x
  3. Step 3: Cross multiply
    840.12x = 1,259.92 × 352.92
  4. Step 4: Simplify right side
    840.12x = 444,650.97
  5. Step 5: Solve for x
    x = 444,650.97/840.12
  6. Step 6: Final answer
    x = 529.27

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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.