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Finding the Fourth Proportional to 18,686.80, 28,005.90 and 7,584.40

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Solution

The fourth proportional to 18,686.80, 28,005.90 and 7,584.40 is: 11,366.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,686.80 : 28,005.90 = 7,584.40 : x
  2. Step 2: Convert to fraction form
    18,686.80/28,005.90 = 7,584.40/x
  3. Step 3: Cross multiply
    18,686.80x = 28,005.90 × 7,584.40
  4. Step 4: Simplify right side
    18,686.80x = 212,407,947.96
  5. Step 5: Solve for x
    x = 212,407,947.96/18,686.80
  6. Step 6: Final answer
    x = 11,366.74

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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.