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Finding the Fourth Proportional to 6,658.88, 9,990.27 and 1,978.92

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Solution

The fourth proportional to 6,658.88, 9,990.27 and 1,978.92 is: 2,968.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,658.88 : 9,990.27 = 1,978.92 : x
  2. Step 2: Convert to fraction form
    6,658.88/9,990.27 = 1,978.92/x
  3. Step 3: Cross multiply
    6,658.88x = 9,990.27 × 1,978.92
  4. Step 4: Simplify right side
    6,658.88x = 19,769,945.11
  5. Step 5: Solve for x
    x = 19,769,945.11/6,658.88
  6. Step 6: Final answer
    x = 2,968.96

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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.