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Finding the Fourth Proportional to 3,487, 5,231.85 and 1,178.50

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Solution

The fourth proportional to 3,487, 5,231.85 and 1,178.50 is: 1,768.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,487 : 5,231.85 = 1,178.50 : x
  2. Step 2: Convert to fraction form
    3,487/5,231.85 = 1,178.50/x
  3. Step 3: Cross multiply
    3,487x = 5,231.85 × 1,178.50
  4. Step 4: Simplify right side
    3,487x = 6,165,735.23
  5. Step 5: Solve for x
    x = 6,165,735.23/3,487
  6. Step 6: Final answer
    x = 1,768.21

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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.