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Finding the Fourth Proportional to 772.78, 1,066.45 and 423.47

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Solution

The fourth proportional to 772.78, 1,066.45 and 423.47 is: 584.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.78 : 1,066.45 = 423.47 : x
  2. Step 2: Convert to fraction form
    772.78/1,066.45 = 423.47/x
  3. Step 3: Cross multiply
    772.78x = 1,066.45 × 423.47
  4. Step 4: Simplify right side
    772.78x = 451,607.46
  5. Step 5: Solve for x
    x = 451,607.46/772.78
  6. Step 6: Final answer
    x = 584.39

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Double scale
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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.