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Finding the Fourth Proportional to 21,398.60, 29,530.22 and 12,899.03

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Solution

The fourth proportional to 21,398.60, 29,530.22 and 12,899.03 is: 17,800.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,398.60 : 29,530.22 = 12,899.03 : x
  2. Step 2: Convert to fraction form
    21,398.60/29,530.22 = 12,899.03/x
  3. Step 3: Cross multiply
    21,398.60x = 29,530.22 × 12,899.03
  4. Step 4: Simplify right side
    21,398.60x = 380,911,198.73
  5. Step 5: Solve for x
    x = 380,911,198.73/21,398.60
  6. Step 6: Final answer
    x = 17,800.75

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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.