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Finding the Fourth Proportional to 13,781.57, 19,018.11 and 7,731.44

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Solution

The fourth proportional to 13,781.57, 19,018.11 and 7,731.44 is: 10,669.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781.57 : 19,018.11 = 7,731.44 : x
  2. Step 2: Convert to fraction form
    13,781.57/19,018.11 = 7,731.44/x
  3. Step 3: Cross multiply
    13,781.57x = 19,018.11 × 7,731.44
  4. Step 4: Simplify right side
    13,781.57x = 147,037,338.11
  5. Step 5: Solve for x
    x = 147,037,338.11/13,781.57
  6. Step 6: Final answer
    x = 10,669.13

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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.