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Finding the Fourth Proportional to 21,188.30, 29,239.87 and 11,756.87

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Solution

The fourth proportional to 21,188.30, 29,239.87 and 11,756.87 is: 16,224.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,188.30 : 29,239.87 = 11,756.87 : x
  2. Step 2: Convert to fraction form
    21,188.30/29,239.87 = 11,756.87/x
  3. Step 3: Cross multiply
    21,188.30x = 29,239.87 × 11,756.87
  4. Step 4: Simplify right side
    21,188.30x = 343,769,204.21
  5. Step 5: Solve for x
    x = 343,769,204.21/21,188.30
  6. Step 6: Final answer
    x = 16,224.48

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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.