Home / 13,215.71-18,228.20-8,178.32

Finding the Fourth Proportional to 13,215.71, 18,228.20 and 8,178.32

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Solution

The fourth proportional to 13,215.71, 18,228.20 and 8,178.32 is: 11,280.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,215.71 : 18,228.20 = 8,178.32 : x
  2. Step 2: Convert to fraction form
    13,215.71/18,228.20 = 8,178.32/x
  3. Step 3: Cross multiply
    13,215.71x = 18,228.20 × 8,178.32
  4. Step 4: Simplify right side
    13,215.71x = 149,076,057.30
  5. Step 5: Solve for x
    x = 149,076,057.30/13,215.71
  6. Step 6: Final answer
    x = 11,280.21

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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.