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Finding the Fourth Proportional to 772.80, 1,066.42 and 423.48

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Solution

The fourth proportional to 772.80, 1,066.42 and 423.48 is: 584.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.80 : 1,066.42 = 423.48 : x
  2. Step 2: Convert to fraction form
    772.80/1,066.42 = 423.48/x
  3. Step 3: Cross multiply
    772.80x = 1,066.42 × 423.48
  4. Step 4: Simplify right side
    772.80x = 451,607.54
  5. Step 5: Solve for x
    x = 451,607.54/772.80
  6. Step 6: Final answer
    x = 584.38

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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.