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Finding the Fourth Proportional to 28,406.20, 42,612.44 and 7,631.32

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Solution

The fourth proportional to 28,406.20, 42,612.44 and 7,631.32 is: 11,447.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,406.20 : 42,612.44 = 7,631.32 : x
  2. Step 2: Convert to fraction form
    28,406.20/42,612.44 = 7,631.32/x
  3. Step 3: Cross multiply
    28,406.20x = 42,612.44 × 7,631.32
  4. Step 4: Simplify right side
    28,406.20x = 325,189,165.62
  5. Step 5: Solve for x
    x = 325,189,165.62/28,406.20
  6. Step 6: Final answer
    x = 11,447.82

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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.