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Finding the Fourth Proportional to 21,661.57, 29,880.49 and 13,041.76

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Solution

The fourth proportional to 21,661.57, 29,880.49 and 13,041.76 is: 17,990.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,661.57 : 29,880.49 = 13,041.76 : x
  2. Step 2: Convert to fraction form
    21,661.57/29,880.49 = 13,041.76/x
  3. Step 3: Cross multiply
    21,661.57x = 29,880.49 × 13,041.76
  4. Step 4: Simplify right side
    21,661.57x = 389,694,029.86
  5. Step 5: Solve for x
    x = 389,694,029.86/21,661.57
  6. Step 6: Final answer
    x = 17,990.11

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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.