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Finding the Fourth Proportional to 674.89, 1,012.83 and 521.20

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Solution

The fourth proportional to 674.89, 1,012.83 and 521.20 is: 782.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.89 : 1,012.83 = 521.20 : x
  2. Step 2: Convert to fraction form
    674.89/1,012.83 = 521.20/x
  3. Step 3: Cross multiply
    674.89x = 1,012.83 × 521.20
  4. Step 4: Simplify right side
    674.89x = 527,887.00
  5. Step 5: Solve for x
    x = 527,887.00/674.89
  6. Step 6: Final answer
    x = 782.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.