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Finding the Fourth Proportional to 1,154.50, 1,731.78 and 385

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Solution

The fourth proportional to 1,154.50, 1,731.78 and 385 is: 577.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,154.50 : 1,731.78 = 385 : x
  2. Step 2: Convert to fraction form
    1,154.50/1,731.78 = 385/x
  3. Step 3: Cross multiply
    1,154.50x = 1,731.78 × 385
  4. Step 4: Simplify right side
    1,154.50x = 666,735.30
  5. Step 5: Solve for x
    x = 666,735.30/1,154.50
  6. Step 6: Final answer
    x = 577.51

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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.