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Finding the Fourth Proportional to 20,267.20, 30,400.80 and 12,904.30

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Solution

The fourth proportional to 20,267.20, 30,400.80 and 12,904.30 is: 19,356.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,267.20 : 30,400.80 = 12,904.30 : x
  2. Step 2: Convert to fraction form
    20,267.20/30,400.80 = 12,904.30/x
  3. Step 3: Cross multiply
    20,267.20x = 30,400.80 × 12,904.30
  4. Step 4: Simplify right side
    20,267.20x = 392,301,043.44
  5. Step 5: Solve for x
    x = 392,301,043.44/20,267.20
  6. Step 6: Final answer
    x = 19,356.45

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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.