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Finding the Fourth Proportional to 20,645.72, 30,970.02 and 8,959.64

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Solution

The fourth proportional to 20,645.72, 30,970.02 and 8,959.64 is: 13,440.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,645.72 : 30,970.02 = 8,959.64 : x
  2. Step 2: Convert to fraction form
    20,645.72/30,970.02 = 8,959.64/x
  3. Step 3: Cross multiply
    20,645.72x = 30,970.02 × 8,959.64
  4. Step 4: Simplify right side
    20,645.72x = 277,480,229.99
  5. Step 5: Solve for x
    x = 277,480,229.99/20,645.72
  6. Step 6: Final answer
    x = 13,440.08

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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.