Home / 20,215.60-30,328.80-18,039.40

Finding the Fourth Proportional to 20,215.60, 30,328.80 and 18,039.40

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Solution

The fourth proportional to 20,215.60, 30,328.80 and 18,039.40 is: 27,063.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,215.60 : 30,328.80 = 18,039.40 : x
  2. Step 2: Convert to fraction form
    20,215.60/30,328.80 = 18,039.40/x
  3. Step 3: Cross multiply
    20,215.60x = 30,328.80 × 18,039.40
  4. Step 4: Simplify right side
    20,215.60x = 547,113,354.72
  5. Step 5: Solve for x
    x = 547,113,354.72/20,215.60
  6. Step 6: Final answer
    x = 27,063.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.