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Finding the Fourth Proportional to 21,138.95, 29,168.43 and 12,639.95

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Solution

The fourth proportional to 21,138.95, 29,168.43 and 12,639.95 is: 17,441.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.95 : 29,168.43 = 12,639.95 : x
  2. Step 2: Convert to fraction form
    21,138.95/29,168.43 = 12,639.95/x
  3. Step 3: Cross multiply
    21,138.95x = 29,168.43 × 12,639.95
  4. Step 4: Simplify right side
    21,138.95x = 368,687,448.47
  5. Step 5: Solve for x
    x = 368,687,448.47/21,138.95
  6. Step 6: Final answer
    x = 17,441.14

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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.