Home / 18,680.40-25,783.20-11,130.78

Finding the Fourth Proportional to 18,680.40, 25,783.20 and 11,130.78

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Solution

The fourth proportional to 18,680.40, 25,783.20 and 11,130.78 is: 15,363.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,680.40 : 25,783.20 = 11,130.78 : x
  2. Step 2: Convert to fraction form
    18,680.40/25,783.20 = 11,130.78/x
  3. Step 3: Cross multiply
    18,680.40x = 25,783.20 × 11,130.78
  4. Step 4: Simplify right side
    18,680.40x = 286,987,126.90
  5. Step 5: Solve for x
    x = 286,987,126.90/18,680.40
  6. Step 6: Final answer
    x = 15,363.01

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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.