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Finding the Fourth Proportional to 1,339.16, 2,008.94 and 645.71

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Solution

The fourth proportional to 1,339.16, 2,008.94 and 645.71 is: 968.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.16 : 2,008.94 = 645.71 : x
  2. Step 2: Convert to fraction form
    1,339.16/2,008.94 = 645.71/x
  3. Step 3: Cross multiply
    1,339.16x = 2,008.94 × 645.71
  4. Step 4: Simplify right side
    1,339.16x = 1,297,179.37
  5. Step 5: Solve for x
    x = 1,297,179.37/1,339.16
  6. Step 6: Final answer
    x = 968.66

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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.