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Finding the Fourth Proportional to 505.12, 696.72 and 422.23

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Solution

The fourth proportional to 505.12, 696.72 and 422.23 is: 582.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.12 : 696.72 = 422.23 : x
  2. Step 2: Convert to fraction form
    505.12/696.72 = 422.23/x
  3. Step 3: Cross multiply
    505.12x = 696.72 × 422.23
  4. Step 4: Simplify right side
    505.12x = 294,176.09
  5. Step 5: Solve for x
    x = 294,176.09/505.12
  6. Step 6: Final answer
    x = 582.39

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1.5x scale

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.