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Finding the Fourth Proportional to 65,620.72, 90,528.19 and 40,128.20

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Solution

The fourth proportional to 65,620.72, 90,528.19 and 40,128.20 is: 55,359.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,620.72 : 90,528.19 = 40,128.20 : x
  2. Step 2: Convert to fraction form
    65,620.72/90,528.19 = 40,128.20/x
  3. Step 3: Cross multiply
    65,620.72x = 90,528.19 × 40,128.20
  4. Step 4: Simplify right side
    65,620.72x = 3,632,733,313.96
  5. Step 5: Solve for x
    x = 3,632,733,313.96/65,620.72
  6. Step 6: Final answer
    x = 55,359.55

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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.