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Finding the Fourth Proportional to 1,015.32, 1,515.39 and 871.32

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Solution

The fourth proportional to 1,015.32, 1,515.39 and 871.32 is: 1,300.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.32 : 1,515.39 = 871.32 : x
  2. Step 2: Convert to fraction form
    1,015.32/1,515.39 = 871.32/x
  3. Step 3: Cross multiply
    1,015.32x = 1,515.39 × 871.32
  4. Step 4: Simplify right side
    1,015.32x = 1,320,389.61
  5. Step 5: Solve for x
    x = 1,320,389.61/1,015.32
  6. Step 6: Final answer
    x = 1,300.47

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.