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Finding the Fourth Proportional to 28,406.40, 42,622.40 and 13,609.60

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Solution

The fourth proportional to 28,406.40, 42,622.40 and 13,609.60 is: 20,420.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,406.40 : 42,622.40 = 13,609.60 : x
  2. Step 2: Convert to fraction form
    28,406.40/42,622.40 = 13,609.60/x
  3. Step 3: Cross multiply
    28,406.40x = 42,622.40 × 13,609.60
  4. Step 4: Simplify right side
    28,406.40x = 580,073,815.04
  5. Step 5: Solve for x
    x = 580,073,815.04/28,406.40
  6. Step 6: Final answer
    x = 20,420.53

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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.