Home / 21,378.88-29,515.62-13,427.92

Finding the Fourth Proportional to 21,378.88, 29,515.62 and 13,427.92

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Solution

The fourth proportional to 21,378.88, 29,515.62 and 13,427.92 is: 18,538.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,378.88 : 29,515.62 = 13,427.92 : x
  2. Step 2: Convert to fraction form
    21,378.88/29,515.62 = 13,427.92/x
  3. Step 3: Cross multiply
    21,378.88x = 29,515.62 × 13,427.92
  4. Step 4: Simplify right side
    21,378.88x = 396,333,384.11
  5. Step 5: Solve for x
    x = 396,333,384.11/21,378.88
  6. Step 6: Final answer
    x = 18,538.55

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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.