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Finding the Fourth Proportional to 5,139, 7,091.82 and 2,781.16

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Solution

The fourth proportional to 5,139, 7,091.82 and 2,781.16 is: 3,838.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,139 : 7,091.82 = 2,781.16 : x
  2. Step 2: Convert to fraction form
    5,139/7,091.82 = 2,781.16/x
  3. Step 3: Cross multiply
    5,139x = 7,091.82 × 2,781.16
  4. Step 4: Simplify right side
    5,139x = 19,723,468.38
  5. Step 5: Solve for x
    x = 19,723,468.38/5,139
  6. Step 6: Final answer
    x = 3,838.00

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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.