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Finding the Fourth Proportional to 772.76, 1,066.41 and 423.45

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Solution

The fourth proportional to 772.76, 1,066.41 and 423.45 is: 584.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.76 : 1,066.41 = 423.45 : x
  2. Step 2: Convert to fraction form
    772.76/1,066.41 = 423.45/x
  3. Step 3: Cross multiply
    772.76x = 1,066.41 × 423.45
  4. Step 4: Simplify right side
    772.76x = 451,571.31
  5. Step 5: Solve for x
    x = 451,571.31/772.76
  6. Step 6: Final answer
    x = 584.36

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Find fourth proportional to 386.38, 533.21 and 211.73
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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.