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Finding the Fourth Proportional to 21,690.40, 29,933.04 and 12,744.64

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Solution

The fourth proportional to 21,690.40, 29,933.04 and 12,744.64 is: 17,587.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,690.40 : 29,933.04 = 12,744.64 : x
  2. Step 2: Convert to fraction form
    21,690.40/29,933.04 = 12,744.64/x
  3. Step 3: Cross multiply
    21,690.40x = 29,933.04 × 12,744.64
  4. Step 4: Simplify right side
    21,690.40x = 381,485,818.91
  5. Step 5: Solve for x
    x = 381,485,818.91/21,690.40
  6. Step 6: Final answer
    x = 17,587.77

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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.