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Finding the Fourth Proportional to 7,871.28, 11,798.28 and 3,970.32

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Solution

The fourth proportional to 7,871.28, 11,798.28 and 3,970.32 is: 5,951.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,871.28 : 11,798.28 = 3,970.32 : x
  2. Step 2: Convert to fraction form
    7,871.28/11,798.28 = 3,970.32/x
  3. Step 3: Cross multiply
    7,871.28x = 11,798.28 × 3,970.32
  4. Step 4: Simplify right side
    7,871.28x = 46,842,947.05
  5. Step 5: Solve for x
    x = 46,842,947.05/7,871.28
  6. Step 6: Final answer
    x = 5,951.12

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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.