Home / 12,591.50-18,886.78-5,190.40

Finding the Fourth Proportional to 12,591.50, 18,886.78 and 5,190.40

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Solution

The fourth proportional to 12,591.50, 18,886.78 and 5,190.40 is: 7,785.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,591.50 : 18,886.78 = 5,190.40 : x
  2. Step 2: Convert to fraction form
    12,591.50/18,886.78 = 5,190.40/x
  3. Step 3: Cross multiply
    12,591.50x = 18,886.78 × 5,190.40
  4. Step 4: Simplify right side
    12,591.50x = 98,029,882.72
  5. Step 5: Solve for x
    x = 98,029,882.72/12,591.50
  6. Step 6: Final answer
    x = 7,785.40

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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.