Home / 21,138.53-29,166.39-12,639.24

Finding the Fourth Proportional to 21,138.53, 29,166.39 and 12,639.24

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Solution

The fourth proportional to 21,138.53, 29,166.39 and 12,639.24 is: 17,439.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.53 : 29,166.39 = 12,639.24 : x
  2. Step 2: Convert to fraction form
    21,138.53/29,166.39 = 12,639.24/x
  3. Step 3: Cross multiply
    21,138.53x = 29,166.39 × 12,639.24
  4. Step 4: Simplify right side
    21,138.53x = 368,641,003.14
  5. Step 5: Solve for x
    x = 368,641,003.14/21,138.53
  6. Step 6: Final answer
    x = 17,439.30

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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.