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Finding the Fourth Proportional to 816.45, 1,221.55 and 469.95

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Solution

The fourth proportional to 816.45, 1,221.55 and 469.95 is: 703.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.45 : 1,221.55 = 469.95 : x
  2. Step 2: Convert to fraction form
    816.45/1,221.55 = 469.95/x
  3. Step 3: Cross multiply
    816.45x = 1,221.55 × 469.95
  4. Step 4: Simplify right side
    816.45x = 574,067.42
  5. Step 5: Solve for x
    x = 574,067.42/816.45
  6. Step 6: Final answer
    x = 703.13

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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.