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Finding the Fourth Proportional to 1,015.91, 1,520.90 and 918.64

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Solution

The fourth proportional to 1,015.91, 1,520.90 and 918.64 is: 1,375.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.91 : 1,520.90 = 918.64 : x
  2. Step 2: Convert to fraction form
    1,015.91/1,520.90 = 918.64/x
  3. Step 3: Cross multiply
    1,015.91x = 1,520.90 × 918.64
  4. Step 4: Simplify right side
    1,015.91x = 1,397,153.48
  5. Step 5: Solve for x
    x = 1,397,153.48/1,015.91
  6. Step 6: Final answer
    x = 1,375.27

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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.