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Finding the Fourth Proportional to 18,611.88, 25,686.42 and 10,656.72

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Solution

The fourth proportional to 18,611.88, 25,686.42 and 10,656.72 is: 14,707.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,611.88 : 25,686.42 = 10,656.72 : x
  2. Step 2: Convert to fraction form
    18,611.88/25,686.42 = 10,656.72/x
  3. Step 3: Cross multiply
    18,611.88x = 25,686.42 × 10,656.72
  4. Step 4: Simplify right side
    18,611.88x = 273,732,985.74
  5. Step 5: Solve for x
    x = 273,732,985.74/18,611.88
  6. Step 6: Final answer
    x = 14,707.43

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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.