Home / 30,979.95-42,759.17-20,370.57

Finding the Fourth Proportional to 30,979.95, 42,759.17 and 20,370.57

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Solution

The fourth proportional to 30,979.95, 42,759.17 and 20,370.57 is: 28,115.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,979.95 : 42,759.17 = 20,370.57 : x
  2. Step 2: Convert to fraction form
    30,979.95/42,759.17 = 20,370.57/x
  3. Step 3: Cross multiply
    30,979.95x = 42,759.17 × 20,370.57
  4. Step 4: Simplify right side
    30,979.95x = 871,028,665.63
  5. Step 5: Solve for x
    x = 871,028,665.63/30,979.95
  6. Step 6: Final answer
    x = 28,115.88

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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.