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Finding the Fourth Proportional to 65,661.86, 90,609.66 and 38,806.88

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Solution

The fourth proportional to 65,661.86, 90,609.66 and 38,806.88 is: 53,551.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,661.86 : 90,609.66 = 38,806.88 : x
  2. Step 2: Convert to fraction form
    65,661.86/90,609.66 = 38,806.88/x
  3. Step 3: Cross multiply
    65,661.86x = 90,609.66 × 38,806.88
  4. Step 4: Simplify right side
    65,661.86x = 3,516,277,749.41
  5. Step 5: Solve for x
    x = 3,516,277,749.41/65,661.86
  6. Step 6: Final answer
    x = 53,551.29

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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.