Home / 21,378.80-29,488.79-12,875.09

Finding the Fourth Proportional to 21,378.80, 29,488.79 and 12,875.09

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Solution

The fourth proportional to 21,378.80, 29,488.79 and 12,875.09 is: 17,759.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,378.80 : 29,488.79 = 12,875.09 : x
  2. Step 2: Convert to fraction form
    21,378.80/29,488.79 = 12,875.09/x
  3. Step 3: Cross multiply
    21,378.80x = 29,488.79 × 12,875.09
  4. Step 4: Simplify right side
    21,378.80x = 379,670,709.98
  5. Step 5: Solve for x
    x = 379,670,709.98/21,378.80
  6. Step 6: Final answer
    x = 17,759.21

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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.