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Finding the Fourth Proportional to 13,459.90, 20,193.99 and 6,890.70

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Solution

The fourth proportional to 13,459.90, 20,193.99 and 6,890.70 is: 10,338.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,459.90 : 20,193.99 = 6,890.70 : x
  2. Step 2: Convert to fraction form
    13,459.90/20,193.99 = 6,890.70/x
  3. Step 3: Cross multiply
    13,459.90x = 20,193.99 × 6,890.70
  4. Step 4: Simplify right side
    13,459.90x = 139,150,726.89
  5. Step 5: Solve for x
    x = 139,150,726.89/13,459.90
  6. Step 6: Final answer
    x = 10,338.17

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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.