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Finding the Fourth Proportional to 20,465.76, 30,646.80 and 12,650.88

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Solution

The fourth proportional to 20,465.76, 30,646.80 and 12,650.88 is: 18,944.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,465.76 : 30,646.80 = 12,650.88 : x
  2. Step 2: Convert to fraction form
    20,465.76/30,646.80 = 12,650.88/x
  3. Step 3: Cross multiply
    20,465.76x = 30,646.80 × 12,650.88
  4. Step 4: Simplify right side
    20,465.76x = 387,708,989.18
  5. Step 5: Solve for x
    x = 387,708,989.18/20,465.76
  6. Step 6: Final answer
    x = 18,944.28

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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.