Home / 1,284.21-1,772.23-724.69

Finding the Fourth Proportional to 1,284.21, 1,772.23 and 724.69

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Solution

The fourth proportional to 1,284.21, 1,772.23 and 724.69 is: 1,000.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.21 : 1,772.23 = 724.69 : x
  2. Step 2: Convert to fraction form
    1,284.21/1,772.23 = 724.69/x
  3. Step 3: Cross multiply
    1,284.21x = 1,772.23 × 724.69
  4. Step 4: Simplify right side
    1,284.21x = 1,284,320.48
  5. Step 5: Solve for x
    x = 1,284,320.48/1,284.21
  6. Step 6: Final answer
    x = 1,000.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.