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Finding the Fourth Proportional to 21,123.84, 29,137.92 and 12,622.08

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Solution

The fourth proportional to 21,123.84, 29,137.92 and 12,622.08 is: 17,410.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,123.84 : 29,137.92 = 12,622.08 : x
  2. Step 2: Convert to fraction form
    21,123.84/29,137.92 = 12,622.08/x
  3. Step 3: Cross multiply
    21,123.84x = 29,137.92 × 12,622.08
  4. Step 4: Simplify right side
    21,123.84x = 367,781,157.27
  5. Step 5: Solve for x
    x = 367,781,157.27/21,123.84
  6. Step 6: Final answer
    x = 17,410.71

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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.