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Finding the Fourth Proportional to 1,150.72, 1,588 and 684.88

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Solution

The fourth proportional to 1,150.72, 1,588 and 684.88 is: 945.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,150.72 : 1,588 = 684.88 : x
  2. Step 2: Convert to fraction form
    1,150.72/1,588 = 684.88/x
  3. Step 3: Cross multiply
    1,150.72x = 1,588 × 684.88
  4. Step 4: Simplify right side
    1,150.72x = 1,087,589.44
  5. Step 5: Solve for x
    x = 1,087,589.44/1,150.72
  6. Step 6: Final answer
    x = 945.14

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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.