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Finding the Fourth Proportional to 6,428.70, 9,641.86 and 2,917.86

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Solution

The fourth proportional to 6,428.70, 9,641.86 and 2,917.86 is: 4,376.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,428.70 : 9,641.86 = 2,917.86 : x
  2. Step 2: Convert to fraction form
    6,428.70/9,641.86 = 2,917.86/x
  3. Step 3: Cross multiply
    6,428.70x = 9,641.86 × 2,917.86
  4. Step 4: Simplify right side
    6,428.70x = 28,133,597.62
  5. Step 5: Solve for x
    x = 28,133,597.62/6,428.70
  6. Step 6: Final answer
    x = 4,376.25

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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.