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Finding the Fourth Proportional to 21,553.86, 29,739.86 and 12,599.63

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Solution

The fourth proportional to 21,553.86, 29,739.86 and 12,599.63 is: 17,384.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,553.86 : 29,739.86 = 12,599.63 : x
  2. Step 2: Convert to fraction form
    21,553.86/29,739.86 = 12,599.63/x
  3. Step 3: Cross multiply
    21,553.86x = 29,739.86 × 12,599.63
  4. Step 4: Simplify right side
    21,553.86x = 374,711,020.55
  5. Step 5: Solve for x
    x = 374,711,020.55/21,553.86
  6. Step 6: Final answer
    x = 17,384.87

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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.