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Finding the Fourth Proportional to 3,813.78, 5,261.48 and 2,487

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Solution

The fourth proportional to 3,813.78, 5,261.48 and 2,487 is: 3,431.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,813.78 : 5,261.48 = 2,487 : x
  2. Step 2: Convert to fraction form
    3,813.78/5,261.48 = 2,487/x
  3. Step 3: Cross multiply
    3,813.78x = 5,261.48 × 2,487
  4. Step 4: Simplify right side
    3,813.78x = 13,085,300.76
  5. Step 5: Solve for x
    x = 13,085,300.76/3,813.78
  6. Step 6: Final answer
    x = 3,431.06

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1.5x scale

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.