Home / 28,456.30-42,684.45-20,145.70

Finding the Fourth Proportional to 28,456.30, 42,684.45 and 20,145.70

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Solution

The fourth proportional to 28,456.30, 42,684.45 and 20,145.70 is: 30,218.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,456.30 : 42,684.45 = 20,145.70 : x
  2. Step 2: Convert to fraction form
    28,456.30/42,684.45 = 20,145.70/x
  3. Step 3: Cross multiply
    28,456.30x = 42,684.45 × 20,145.70
  4. Step 4: Simplify right side
    28,456.30x = 859,908,124.37
  5. Step 5: Solve for x
    x = 859,908,124.37/28,456.30
  6. Step 6: Final answer
    x = 30,218.55

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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.