Home / 1,153.12-1,731.30-720.64

Finding the Fourth Proportional to 1,153.12, 1,731.30 and 720.64

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Solution

The fourth proportional to 1,153.12, 1,731.30 and 720.64 is: 1,081.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.12 : 1,731.30 = 720.64 : x
  2. Step 2: Convert to fraction form
    1,153.12/1,731.30 = 720.64/x
  3. Step 3: Cross multiply
    1,153.12x = 1,731.30 × 720.64
  4. Step 4: Simplify right side
    1,153.12x = 1,247,644.03
  5. Step 5: Solve for x
    x = 1,247,644.03/1,153.12
  6. Step 6: Final answer
    x = 1,081.97

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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.