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Finding the Fourth Proportional to 782.67, 1,080.06 and 428.58

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Solution

The fourth proportional to 782.67, 1,080.06 and 428.58 is: 591.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.67 : 1,080.06 = 428.58 : x
  2. Step 2: Convert to fraction form
    782.67/1,080.06 = 428.58/x
  3. Step 3: Cross multiply
    782.67x = 1,080.06 × 428.58
  4. Step 4: Simplify right side
    782.67x = 462,892.11
  5. Step 5: Solve for x
    x = 462,892.11/782.67
  6. Step 6: Final answer
    x = 591.43

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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.