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Finding the Fourth Proportional to 772.75, 1,066.40 and 423.44

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Solution

The fourth proportional to 772.75, 1,066.40 and 423.44 is: 584.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.75 : 1,066.40 = 423.44 : x
  2. Step 2: Convert to fraction form
    772.75/1,066.40 = 423.44/x
  3. Step 3: Cross multiply
    772.75x = 1,066.40 × 423.44
  4. Step 4: Simplify right side
    772.75x = 451,556.42
  5. Step 5: Solve for x
    x = 451,556.42/772.75
  6. Step 6: Final answer
    x = 584.35

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Find fourth proportional to 386.38, 533.20 and 211.72
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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.