Home / 30,724.16-42,399.35-17,979.78

Finding the Fourth Proportional to 30,724.16, 42,399.35 and 17,979.78

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Solution

The fourth proportional to 30,724.16, 42,399.35 and 17,979.78 is: 24,812.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,724.16 : 42,399.35 = 17,979.78 : x
  2. Step 2: Convert to fraction form
    30,724.16/42,399.35 = 17,979.78/x
  3. Step 3: Cross multiply
    30,724.16x = 42,399.35 × 17,979.78
  4. Step 4: Simplify right side
    30,724.16x = 762,330,895.24
  5. Step 5: Solve for x
    x = 762,330,895.24/30,724.16
  6. Step 6: Final answer
    x = 24,812.10

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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.