Home / 21,643.74-29,863.29-13,145.63

Finding the Fourth Proportional to 21,643.74, 29,863.29 and 13,145.63

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Solution

The fourth proportional to 21,643.74, 29,863.29 and 13,145.63 is: 18,137.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,643.74 : 29,863.29 = 13,145.63 : x
  2. Step 2: Convert to fraction form
    21,643.74/29,863.29 = 13,145.63/x
  3. Step 3: Cross multiply
    21,643.74x = 29,863.29 × 13,145.63
  4. Step 4: Simplify right side
    21,643.74x = 392,571,772.89
  5. Step 5: Solve for x
    x = 392,571,772.89/21,643.74
  6. Step 6: Final answer
    x = 18,137.89

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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.