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Finding the Fourth Proportional to 13,611.01, 18,781.90 and 7,641.31

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Solution

The fourth proportional to 13,611.01, 18,781.90 and 7,641.31 is: 10,544.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,611.01 : 18,781.90 = 7,641.31 : x
  2. Step 2: Convert to fraction form
    13,611.01/18,781.90 = 7,641.31/x
  3. Step 3: Cross multiply
    13,611.01x = 18,781.90 × 7,641.31
  4. Step 4: Simplify right side
    13,611.01x = 143,518,320.29
  5. Step 5: Solve for x
    x = 143,518,320.29/13,611.01
  6. Step 6: Final answer
    x = 10,544.28

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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.