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Finding the Fourth Proportional to 21,390.01, 29,512.19 and 12,775.18

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Solution

The fourth proportional to 21,390.01, 29,512.19 and 12,775.18 is: 17,626.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,390.01 : 29,512.19 = 12,775.18 : x
  2. Step 2: Convert to fraction form
    21,390.01/29,512.19 = 12,775.18/x
  3. Step 3: Cross multiply
    21,390.01x = 29,512.19 × 12,775.18
  4. Step 4: Simplify right side
    21,390.01x = 377,023,539.44
  5. Step 5: Solve for x
    x = 377,023,539.44/21,390.01
  6. Step 6: Final answer
    x = 17,626.15

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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.