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Finding the Fourth Proportional to 21,659.70, 29,890.89 and 12,713.67

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Solution

The fourth proportional to 21,659.70, 29,890.89 and 12,713.67 is: 17,545.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,659.70 : 29,890.89 = 12,713.67 : x
  2. Step 2: Convert to fraction form
    21,659.70/29,890.89 = 12,713.67/x
  3. Step 3: Cross multiply
    21,659.70x = 29,890.89 × 12,713.67
  4. Step 4: Simplify right side
    21,659.70x = 380,022,911.47
  5. Step 5: Solve for x
    x = 380,022,911.47/21,659.70
  6. Step 6: Final answer
    x = 17,545.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.