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Finding the Fourth Proportional to 13,006.60, 19,509.90 and 8,091.40

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Solution

The fourth proportional to 13,006.60, 19,509.90 and 8,091.40 is: 12,137.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,006.60 : 19,509.90 = 8,091.40 : x
  2. Step 2: Convert to fraction form
    13,006.60/19,509.90 = 8,091.40/x
  3. Step 3: Cross multiply
    13,006.60x = 19,509.90 × 8,091.40
  4. Step 4: Simplify right side
    13,006.60x = 157,862,404.86
  5. Step 5: Solve for x
    x = 157,862,404.86/13,006.60
  6. Step 6: Final answer
    x = 12,137.10

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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.