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Finding the Fourth Proportional to 1,008.99, 1,512.90 and 521.91

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Solution

The fourth proportional to 1,008.99, 1,512.90 and 521.91 is: 782.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.99 : 1,512.90 = 521.91 : x
  2. Step 2: Convert to fraction form
    1,008.99/1,512.90 = 521.91/x
  3. Step 3: Cross multiply
    1,008.99x = 1,512.90 × 521.91
  4. Step 4: Simplify right side
    1,008.99x = 789,597.64
  5. Step 5: Solve for x
    x = 789,597.64/1,008.99
  6. Step 6: Final answer
    x = 782.56

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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.