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Finding the Fourth Proportional to 18,713.80, 28,046.40 and 7,611.40

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Solution

The fourth proportional to 18,713.80, 28,046.40 and 7,611.40 is: 11,407.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,713.80 : 28,046.40 = 7,611.40 : x
  2. Step 2: Convert to fraction form
    18,713.80/28,046.40 = 7,611.40/x
  3. Step 3: Cross multiply
    18,713.80x = 28,046.40 × 7,611.40
  4. Step 4: Simplify right side
    18,713.80x = 213,472,368.96
  5. Step 5: Solve for x
    x = 213,472,368.96/18,713.80
  6. Step 6: Final answer
    x = 11,407.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.