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Finding the Fourth Proportional to 15,035.20, 20,749.92 and 8,322.40

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Solution

The fourth proportional to 15,035.20, 20,749.92 and 8,322.40 is: 11,485.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,035.20 : 20,749.92 = 8,322.40 : x
  2. Step 2: Convert to fraction form
    15,035.20/20,749.92 = 8,322.40/x
  3. Step 3: Cross multiply
    15,035.20x = 20,749.92 × 8,322.40
  4. Step 4: Simplify right side
    15,035.20x = 172,689,134.21
  5. Step 5: Solve for x
    x = 172,689,134.21/15,035.20
  6. Step 6: Final answer
    x = 11,485.66

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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.