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Finding the Fourth Proportional to 842.08, 1,263.40 and 409.20

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Solution

The fourth proportional to 842.08, 1,263.40 and 409.20 is: 613.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.08 : 1,263.40 = 409.20 : x
  2. Step 2: Convert to fraction form
    842.08/1,263.40 = 409.20/x
  3. Step 3: Cross multiply
    842.08x = 1,263.40 × 409.20
  4. Step 4: Simplify right side
    842.08x = 516,983.28
  5. Step 5: Solve for x
    x = 516,983.28/842.08
  6. Step 6: Final answer
    x = 613.94

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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.