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Finding the Fourth Proportional to 1,015.16, 1,523.43 and 391.01

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Solution

The fourth proportional to 1,015.16, 1,523.43 and 391.01 is: 586.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.16 : 1,523.43 = 391.01 : x
  2. Step 2: Convert to fraction form
    1,015.16/1,523.43 = 391.01/x
  3. Step 3: Cross multiply
    1,015.16x = 1,523.43 × 391.01
  4. Step 4: Simplify right side
    1,015.16x = 595,668.75
  5. Step 5: Solve for x
    x = 595,668.75/1,015.16
  6. Step 6: Final answer
    x = 586.78

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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.