Home / 21,289.28-29,380.80-12,339.20

Finding the Fourth Proportional to 21,289.28, 29,380.80 and 12,339.20

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Solution

The fourth proportional to 21,289.28, 29,380.80 and 12,339.20 is: 17,029.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,289.28 : 29,380.80 = 12,339.20 : x
  2. Step 2: Convert to fraction form
    21,289.28/29,380.80 = 12,339.20/x
  3. Step 3: Cross multiply
    21,289.28x = 29,380.80 × 12,339.20
  4. Step 4: Simplify right side
    21,289.28x = 362,535,567.36
  5. Step 5: Solve for x
    x = 362,535,567.36/21,289.28
  6. Step 6: Final answer
    x = 17,029.02

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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.