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Finding the Fourth Proportional to 20,458.40, 30,687.60 and 20,328.80

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Solution

The fourth proportional to 20,458.40, 30,687.60 and 20,328.80 is: 30,493.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,458.40 : 30,687.60 = 20,328.80 : x
  2. Step 2: Convert to fraction form
    20,458.40/30,687.60 = 20,328.80/x
  3. Step 3: Cross multiply
    20,458.40x = 30,687.60 × 20,328.80
  4. Step 4: Simplify right side
    20,458.40x = 623,842,082.88
  5. Step 5: Solve for x
    x = 623,842,082.88/20,458.40
  6. Step 6: Final answer
    x = 30,493.20

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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.