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Finding the Fourth Proportional to 1,008.28, 1,513.45 and 521.68

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Solution

The fourth proportional to 1,008.28, 1,513.45 and 521.68 is: 783.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.28 : 1,513.45 = 521.68 : x
  2. Step 2: Convert to fraction form
    1,008.28/1,513.45 = 521.68/x
  3. Step 3: Cross multiply
    1,008.28x = 1,513.45 × 521.68
  4. Step 4: Simplify right side
    1,008.28x = 789,536.60
  5. Step 5: Solve for x
    x = 789,536.60/1,008.28
  6. Step 6: Final answer
    x = 783.05

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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.