Home / 20,816.39-28,691.62-15,779.00

Finding the Fourth Proportional to 20,816.39, 28,691.62 and 15,779.00

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Solution

The fourth proportional to 20,816.39, 28,691.62 and 15,779.00 is: 21,748.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,816.39 : 28,691.62 = 15,779.00 : x
  2. Step 2: Convert to fraction form
    20,816.39/28,691.62 = 15,779.00/x
  3. Step 3: Cross multiply
    20,816.39x = 28,691.62 × 15,779.00
  4. Step 4: Simplify right side
    20,816.39x = 452,725,104.26
  5. Step 5: Solve for x
    x = 452,725,104.26/20,816.39
  6. Step 6: Final answer
    x = 21,748.49

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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.