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Finding the Fourth Proportional to 30,672.72, 45,962.16 and 20,640.33

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Solution

The fourth proportional to 30,672.72, 45,962.16 and 20,640.33 is: 30,928.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,672.72 : 45,962.16 = 20,640.33 : x
  2. Step 2: Convert to fraction form
    30,672.72/45,962.16 = 20,640.33/x
  3. Step 3: Cross multiply
    30,672.72x = 45,962.16 × 20,640.33
  4. Step 4: Simplify right side
    30,672.72x = 948,674,149.91
  5. Step 5: Solve for x
    x = 948,674,149.91/30,672.72
  6. Step 6: Final answer
    x = 30,928.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.