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Finding the Fourth Proportional to 772.31, 1,065.80 and 423

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Solution

The fourth proportional to 772.31, 1,065.80 and 423 is: 583.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.31 : 1,065.80 = 423 : x
  2. Step 2: Convert to fraction form
    772.31/1,065.80 = 423/x
  3. Step 3: Cross multiply
    772.31x = 1,065.80 × 423
  4. Step 4: Simplify right side
    772.31x = 450,832.08
  5. Step 5: Solve for x
    x = 450,832.08/772.31
  6. Step 6: Final answer
    x = 583.74

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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.