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Finding the Fourth Proportional to 13,603.10, 20,404.65 and 11,659.10

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Solution

The fourth proportional to 13,603.10, 20,404.65 and 11,659.10 is: 17,488.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,603.10 : 20,404.65 = 11,659.10 : x
  2. Step 2: Convert to fraction form
    13,603.10/20,404.65 = 11,659.10/x
  3. Step 3: Cross multiply
    13,603.10x = 20,404.65 × 11,659.10
  4. Step 4: Simplify right side
    13,603.10x = 237,899,854.82
  5. Step 5: Solve for x
    x = 237,899,854.82/13,603.10
  6. Step 6: Final answer
    x = 17,488.65

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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.