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Finding the Fourth Proportional to 641.06, 884.76 and 405.20

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Solution

The fourth proportional to 641.06, 884.76 and 405.20 is: 559.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.06 : 884.76 = 405.20 : x
  2. Step 2: Convert to fraction form
    641.06/884.76 = 405.20/x
  3. Step 3: Cross multiply
    641.06x = 884.76 × 405.20
  4. Step 4: Simplify right side
    641.06x = 358,504.75
  5. Step 5: Solve for x
    x = 358,504.75/641.06
  6. Step 6: Final answer
    x = 559.24

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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.