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Finding the Fourth Proportional to 641.95, 886.15 and 418.20

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Solution

The fourth proportional to 641.95, 886.15 and 418.20 is: 577.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.95 : 886.15 = 418.20 : x
  2. Step 2: Convert to fraction form
    641.95/886.15 = 418.20/x
  3. Step 3: Cross multiply
    641.95x = 886.15 × 418.20
  4. Step 4: Simplify right side
    641.95x = 370,587.93
  5. Step 5: Solve for x
    x = 370,587.93/641.95
  6. Step 6: Final answer
    x = 577.28

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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.