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Finding the Fourth Proportional to 21,060.70, 31,563.09 and 11,178.70

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Solution

The fourth proportional to 21,060.70, 31,563.09 and 11,178.70 is: 16,753.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,060.70 : 31,563.09 = 11,178.70 : x
  2. Step 2: Convert to fraction form
    21,060.70/31,563.09 = 11,178.70/x
  3. Step 3: Cross multiply
    21,060.70x = 31,563.09 × 11,178.70
  4. Step 4: Simplify right side
    21,060.70x = 352,834,235.28
  5. Step 5: Solve for x
    x = 352,834,235.28/21,060.70
  6. Step 6: Final answer
    x = 16,753.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.