Home / 30,628.08-42,228-20,000.88

Finding the Fourth Proportional to 30,628.08, 42,228 and 20,000.88

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Solution

The fourth proportional to 30,628.08, 42,228 and 20,000.88 is: 27,575.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,628.08 : 42,228 = 20,000.88 : x
  2. Step 2: Convert to fraction form
    30,628.08/42,228 = 20,000.88/x
  3. Step 3: Cross multiply
    30,628.08x = 42,228 × 20,000.88
  4. Step 4: Simplify right side
    30,628.08x = 844,597,160.64
  5. Step 5: Solve for x
    x = 844,597,160.64/30,628.08
  6. Step 6: Final answer
    x = 27,575.91

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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.