Home / 15,120.36-20,861.28-9,150.12

Finding the Fourth Proportional to 15,120.36, 20,861.28 and 9,150.12

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Solution

The fourth proportional to 15,120.36, 20,861.28 and 9,150.12 is: 12,624.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,120.36 : 20,861.28 = 9,150.12 : x
  2. Step 2: Convert to fraction form
    15,120.36/20,861.28 = 9,150.12/x
  3. Step 3: Cross multiply
    15,120.36x = 20,861.28 × 9,150.12
  4. Step 4: Simplify right side
    15,120.36x = 190,883,215.35
  5. Step 5: Solve for x
    x = 190,883,215.35/15,120.36
  6. Step 6: Final answer
    x = 12,624.25

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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.