Home / 15,120.81-20,861.19-9,150.30

Finding the Fourth Proportional to 15,120.81, 20,861.19 and 9,150.30

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Solution

The fourth proportional to 15,120.81, 20,861.19 and 9,150.30 is: 12,624.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,120.81 : 20,861.19 = 9,150.30 : x
  2. Step 2: Convert to fraction form
    15,120.81/20,861.19 = 9,150.30/x
  3. Step 3: Cross multiply
    15,120.81x = 20,861.19 × 9,150.30
  4. Step 4: Simplify right side
    15,120.81x = 190,886,146.86
  5. Step 5: Solve for x
    x = 190,886,146.86/15,120.81
  6. Step 6: Final answer
    x = 12,624.07

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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.