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Finding the Fourth Proportional to 6,661.64, 9,989.34 and 3,889.12

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Solution

The fourth proportional to 6,661.64, 9,989.34 and 3,889.12 is: 5,831.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,661.64 : 9,989.34 = 3,889.12 : x
  2. Step 2: Convert to fraction form
    6,661.64/9,989.34 = 3,889.12/x
  3. Step 3: Cross multiply
    6,661.64x = 9,989.34 × 3,889.12
  4. Step 4: Simplify right side
    6,661.64x = 38,849,741.98
  5. Step 5: Solve for x
    x = 38,849,741.98/6,661.64
  6. Step 6: Final answer
    x = 5,831.86

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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.