Home / 1,515.78-2,272.23-693.57

Finding the Fourth Proportional to 1,515.78, 2,272.23 and 693.57

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Solution

The fourth proportional to 1,515.78, 2,272.23 and 693.57 is: 1,039.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515.78 : 2,272.23 = 693.57 : x
  2. Step 2: Convert to fraction form
    1,515.78/2,272.23 = 693.57/x
  3. Step 3: Cross multiply
    1,515.78x = 2,272.23 × 693.57
  4. Step 4: Simplify right side
    1,515.78x = 1,575,950.56
  5. Step 5: Solve for x
    x = 1,575,950.56/1,515.78
  6. Step 6: Final answer
    x = 1,039.70

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1.5x scale

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.