Home / 21,580.12-29,779.32-13,909.78

Finding the Fourth Proportional to 21,580.12, 29,779.32 and 13,909.78

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Solution

The fourth proportional to 21,580.12, 29,779.32 and 13,909.78 is: 19,194.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,580.12 : 29,779.32 = 13,909.78 : x
  2. Step 2: Convert to fraction form
    21,580.12/29,779.32 = 13,909.78/x
  3. Step 3: Cross multiply
    21,580.12x = 29,779.32 × 13,909.78
  4. Step 4: Simplify right side
    21,580.12x = 414,223,789.75
  5. Step 5: Solve for x
    x = 414,223,789.75/21,580.12
  6. Step 6: Final answer
    x = 19,194.69

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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.