Home / 1,515.21-2,271.29-864.57

Finding the Fourth Proportional to 1,515.21, 2,271.29 and 864.57

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Solution

The fourth proportional to 1,515.21, 2,271.29 and 864.57 is: 1,295.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515.21 : 2,271.29 = 864.57 : x
  2. Step 2: Convert to fraction form
    1,515.21/2,271.29 = 864.57/x
  3. Step 3: Cross multiply
    1,515.21x = 2,271.29 × 864.57
  4. Step 4: Simplify right side
    1,515.21x = 1,963,684.87
  5. Step 5: Solve for x
    x = 1,963,684.87/1,515.21
  6. Step 6: Final answer
    x = 1,295.98

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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.