Home / 21,138.81-29,169.51-12,639.24

Finding the Fourth Proportional to 21,138.81, 29,169.51 and 12,639.24

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Solution

The fourth proportional to 21,138.81, 29,169.51 and 12,639.24 is: 17,440.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.81 : 29,169.51 = 12,639.24 : x
  2. Step 2: Convert to fraction form
    21,138.81/29,169.51 = 12,639.24/x
  3. Step 3: Cross multiply
    21,138.81x = 29,169.51 × 12,639.24
  4. Step 4: Simplify right side
    21,138.81x = 368,680,437.57
  5. Step 5: Solve for x
    x = 368,680,437.57/21,138.81
  6. Step 6: Final answer
    x = 17,440.93

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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.