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Finding the Fourth Proportional to 1,157.18, 1,736 and 426.76

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Solution

The fourth proportional to 1,157.18, 1,736 and 426.76 is: 640.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,157.18 : 1,736 = 426.76 : x
  2. Step 2: Convert to fraction form
    1,157.18/1,736 = 426.76/x
  3. Step 3: Cross multiply
    1,157.18x = 1,736 × 426.76
  4. Step 4: Simplify right side
    1,157.18x = 740,855.36
  5. Step 5: Solve for x
    x = 740,855.36/1,157.18
  6. Step 6: Final answer
    x = 640.22

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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.