Home / 1,143.12-1,718.49-928.20

Finding the Fourth Proportional to 1,143.12, 1,718.49 and 928.20

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Solution

The fourth proportional to 1,143.12, 1,718.49 and 928.20 is: 1,395.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.12 : 1,718.49 = 928.20 : x
  2. Step 2: Convert to fraction form
    1,143.12/1,718.49 = 928.20/x
  3. Step 3: Cross multiply
    1,143.12x = 1,718.49 × 928.20
  4. Step 4: Simplify right side
    1,143.12x = 1,595,102.42
  5. Step 5: Solve for x
    x = 1,595,102.42/1,143.12
  6. Step 6: Final answer
    x = 1,395.39

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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.