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Finding the Fourth Proportional to 20,487.40, 30,722.40 and 8,633.48

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Solution

The fourth proportional to 20,487.40, 30,722.40 and 8,633.48 is: 12,946.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487.40 : 30,722.40 = 8,633.48 : x
  2. Step 2: Convert to fraction form
    20,487.40/30,722.40 = 8,633.48/x
  3. Step 3: Cross multiply
    20,487.40x = 30,722.40 × 8,633.48
  4. Step 4: Simplify right side
    20,487.40x = 265,241,225.95
  5. Step 5: Solve for x
    x = 265,241,225.95/20,487.40
  6. Step 6: Final answer
    x = 12,946.55

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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.