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Finding the Fourth Proportional to 611.04, 842.88 and 400.80

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Solution

The fourth proportional to 611.04, 842.88 and 400.80 is: 552.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.04 : 842.88 = 400.80 : x
  2. Step 2: Convert to fraction form
    611.04/842.88 = 400.80/x
  3. Step 3: Cross multiply
    611.04x = 842.88 × 400.80
  4. Step 4: Simplify right side
    611.04x = 337,826.30
  5. Step 5: Solve for x
    x = 337,826.30/611.04
  6. Step 6: Final answer
    x = 552.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.