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Finding the Fourth Proportional to 28,493.40, 42,740.10 and 20,620.20

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Solution

The fourth proportional to 28,493.40, 42,740.10 and 20,620.20 is: 30,930.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,493.40 : 42,740.10 = 20,620.20 : x
  2. Step 2: Convert to fraction form
    28,493.40/42,740.10 = 20,620.20/x
  3. Step 3: Cross multiply
    28,493.40x = 42,740.10 × 20,620.20
  4. Step 4: Simplify right side
    28,493.40x = 881,309,410.02
  5. Step 5: Solve for x
    x = 881,309,410.02/28,493.40
  6. Step 6: Final answer
    x = 30,930.30

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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.