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Finding the Fourth Proportional to 7,990.68, 11,978.46 and 4,287.36

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Solution

The fourth proportional to 7,990.68, 11,978.46 and 4,287.36 is: 6,426.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,990.68 : 11,978.46 = 4,287.36 : x
  2. Step 2: Convert to fraction form
    7,990.68/11,978.46 = 4,287.36/x
  3. Step 3: Cross multiply
    7,990.68x = 11,978.46 × 4,287.36
  4. Step 4: Simplify right side
    7,990.68x = 51,355,970.27
  5. Step 5: Solve for x
    x = 51,355,970.27/7,990.68
  6. Step 6: Final answer
    x = 6,426.98

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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.