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Finding the Fourth Proportional to 6,665.87, 9,999.31 and 1,985.79

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Solution

The fourth proportional to 6,665.87, 9,999.31 and 1,985.79 is: 2,978.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,665.87 : 9,999.31 = 1,985.79 : x
  2. Step 2: Convert to fraction form
    6,665.87/9,999.31 = 1,985.79/x
  3. Step 3: Cross multiply
    6,665.87x = 9,999.31 × 1,985.79
  4. Step 4: Simplify right side
    6,665.87x = 19,856,529.80
  5. Step 5: Solve for x
    x = 19,856,529.80/6,665.87
  6. Step 6: Final answer
    x = 2,978.84

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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.