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Finding the Fourth Proportional to 11,695.60, 16,139.89 and 6,390.46

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Solution

The fourth proportional to 11,695.60, 16,139.89 and 6,390.46 is: 8,818.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,695.60 : 16,139.89 = 6,390.46 : x
  2. Step 2: Convert to fraction form
    11,695.60/16,139.89 = 6,390.46/x
  3. Step 3: Cross multiply
    11,695.60x = 16,139.89 × 6,390.46
  4. Step 4: Simplify right side
    11,695.60x = 103,141,265.12
  5. Step 5: Solve for x
    x = 103,141,265.12/11,695.60
  6. Step 6: Final answer
    x = 8,818.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.