Home / 21,165.58-29,209.71-12,784.78

Finding the Fourth Proportional to 21,165.58, 29,209.71 and 12,784.78

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Solution

The fourth proportional to 21,165.58, 29,209.71 and 12,784.78 is: 17,643.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,165.58 : 29,209.71 = 12,784.78 : x
  2. Step 2: Convert to fraction form
    21,165.58/29,209.71 = 12,784.78/x
  3. Step 3: Cross multiply
    21,165.58x = 29,209.71 × 12,784.78
  4. Step 4: Simplify right side
    21,165.58x = 373,439,716.21
  5. Step 5: Solve for x
    x = 373,439,716.21/21,165.58
  6. Step 6: Final answer
    x = 17,643.73

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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.