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Finding the Fourth Proportional to 1,156.78, 1,735.78 and 426.57

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Solution

The fourth proportional to 1,156.78, 1,735.78 and 426.57 is: 640.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,156.78 : 1,735.78 = 426.57 : x
  2. Step 2: Convert to fraction form
    1,156.78/1,735.78 = 426.57/x
  3. Step 3: Cross multiply
    1,156.78x = 1,735.78 × 426.57
  4. Step 4: Simplify right side
    1,156.78x = 740,424.90
  5. Step 5: Solve for x
    x = 740,424.90/1,156.78
  6. Step 6: Final answer
    x = 640.07

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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.