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Finding the Fourth Proportional to 18,409.72, 25,407.18 and 11,340.28

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Solution

The fourth proportional to 18,409.72, 25,407.18 and 11,340.28 is: 15,650.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,409.72 : 25,407.18 = 11,340.28 : x
  2. Step 2: Convert to fraction form
    18,409.72/25,407.18 = 11,340.28/x
  3. Step 3: Cross multiply
    18,409.72x = 25,407.18 × 11,340.28
  4. Step 4: Simplify right side
    18,409.72x = 288,124,535.21
  5. Step 5: Solve for x
    x = 288,124,535.21/18,409.72
  6. Step 6: Final answer
    x = 15,650.67

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Double scale
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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.