Home / 21,729.77-29,987.80-12,778.10

Finding the Fourth Proportional to 21,729.77, 29,987.80 and 12,778.10

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Solution

The fourth proportional to 21,729.77, 29,987.80 and 12,778.10 is: 17,634.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,729.77 : 29,987.80 = 12,778.10 : x
  2. Step 2: Convert to fraction form
    21,729.77/29,987.80 = 12,778.10/x
  3. Step 3: Cross multiply
    21,729.77x = 29,987.80 × 12,778.10
  4. Step 4: Simplify right side
    21,729.77x = 383,187,278.31
  5. Step 5: Solve for x
    x = 383,187,278.31/21,729.77
  6. Step 6: Final answer
    x = 17,634.21

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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.