Home / 30,718.72-42,391.20-18,782.20

Finding the Fourth Proportional to 30,718.72, 42,391.20 and 18,782.20

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Solution

The fourth proportional to 30,718.72, 42,391.20 and 18,782.20 is: 25,919.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,718.72 : 42,391.20 = 18,782.20 : x
  2. Step 2: Convert to fraction form
    30,718.72/42,391.20 = 18,782.20/x
  3. Step 3: Cross multiply
    30,718.72x = 42,391.20 × 18,782.20
  4. Step 4: Simplify right side
    30,718.72x = 796,199,996.64
  5. Step 5: Solve for x
    x = 796,199,996.64/30,718.72
  6. Step 6: Final answer
    x = 25,919.05

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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.