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Finding the Fourth Proportional to 1,012.87, 1,515.66 and 988.57

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Solution

The fourth proportional to 1,012.87, 1,515.66 and 988.57 is: 1,479.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.87 : 1,515.66 = 988.57 : x
  2. Step 2: Convert to fraction form
    1,012.87/1,515.66 = 988.57/x
  3. Step 3: Cross multiply
    1,012.87x = 1,515.66 × 988.57
  4. Step 4: Simplify right side
    1,012.87x = 1,498,336.01
  5. Step 5: Solve for x
    x = 1,498,336.01/1,012.87
  6. Step 6: Final answer
    x = 1,479.30

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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.