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Finding the Fourth Proportional to 1,015.89, 1,522.68 and 399.29

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Solution

The fourth proportional to 1,015.89, 1,522.68 and 399.29 is: 598.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.89 : 1,522.68 = 399.29 : x
  2. Step 2: Convert to fraction form
    1,015.89/1,522.68 = 399.29/x
  3. Step 3: Cross multiply
    1,015.89x = 1,522.68 × 399.29
  4. Step 4: Simplify right side
    1,015.89x = 607,983.28
  5. Step 5: Solve for x
    x = 607,983.28/1,015.89
  6. Step 6: Final answer
    x = 598.47

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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.