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Finding the Fourth Proportional to 13,396.78, 20,064.93 and 7,145.74

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Solution

The fourth proportional to 13,396.78, 20,064.93 and 7,145.74 is: 10,702.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,396.78 : 20,064.93 = 7,145.74 : x
  2. Step 2: Convert to fraction form
    13,396.78/20,064.93 = 7,145.74/x
  3. Step 3: Cross multiply
    13,396.78x = 20,064.93 × 7,145.74
  4. Step 4: Simplify right side
    13,396.78x = 143,378,772.90
  5. Step 5: Solve for x
    x = 143,378,772.90/13,396.78
  6. Step 6: Final answer
    x = 10,702.48

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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.