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Finding the Fourth Proportional to 6,620.79, 9,931.17 and 1,690.43

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Solution

The fourth proportional to 6,620.79, 9,931.17 and 1,690.43 is: 2,535.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,620.79 : 9,931.17 = 1,690.43 : x
  2. Step 2: Convert to fraction form
    6,620.79/9,931.17 = 1,690.43/x
  3. Step 3: Cross multiply
    6,620.79x = 9,931.17 × 1,690.43
  4. Step 4: Simplify right side
    6,620.79x = 16,787,898.05
  5. Step 5: Solve for x
    x = 16,787,898.05/6,620.79
  6. Step 6: Final answer
    x = 2,535.64

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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.