Home / 20,145.60-30,218.40-19,999.80

Finding the Fourth Proportional to 20,145.60, 30,218.40 and 19,999.80

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Solution

The fourth proportional to 20,145.60, 30,218.40 and 19,999.80 is: 29,999.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,145.60 : 30,218.40 = 19,999.80 : x
  2. Step 2: Convert to fraction form
    20,145.60/30,218.40 = 19,999.80/x
  3. Step 3: Cross multiply
    20,145.60x = 30,218.40 × 19,999.80
  4. Step 4: Simplify right side
    20,145.60x = 604,361,956.32
  5. Step 5: Solve for x
    x = 604,361,956.32/20,145.60
  6. Step 6: Final answer
    x = 29,999.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.