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Finding the Fourth Proportional to 21,755.89, 30,022.55 and 12,803.92

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Solution

The fourth proportional to 21,755.89, 30,022.55 and 12,803.92 is: 17,669.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,755.89 : 30,022.55 = 12,803.92 : x
  2. Step 2: Convert to fraction form
    21,755.89/30,022.55 = 12,803.92/x
  3. Step 3: Cross multiply
    21,755.89x = 30,022.55 × 12,803.92
  4. Step 4: Simplify right side
    21,755.89x = 384,406,264.38
  5. Step 5: Solve for x
    x = 384,406,264.38/21,755.89
  6. Step 6: Final answer
    x = 17,669.07

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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.