Home / 13,178.70-18,188.28-8,645.21

Finding the Fourth Proportional to 13,178.70, 18,188.28 and 8,645.21

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Solution

The fourth proportional to 13,178.70, 18,188.28 and 8,645.21 is: 11,931.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,178.70 : 18,188.28 = 8,645.21 : x
  2. Step 2: Convert to fraction form
    13,178.70/18,188.28 = 8,645.21/x
  3. Step 3: Cross multiply
    13,178.70x = 18,188.28 × 8,645.21
  4. Step 4: Simplify right side
    13,178.70x = 157,241,409.20
  5. Step 5: Solve for x
    x = 157,241,409.20/13,178.70
  6. Step 6: Final answer
    x = 11,931.48

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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.