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Finding the Fourth Proportional to 1,517.82, 2,275.58 and 640.59

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Solution

The fourth proportional to 1,517.82, 2,275.58 and 640.59 is: 960.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,517.82 : 2,275.58 = 640.59 : x
  2. Step 2: Convert to fraction form
    1,517.82/2,275.58 = 640.59/x
  3. Step 3: Cross multiply
    1,517.82x = 2,275.58 × 640.59
  4. Step 4: Simplify right side
    1,517.82x = 1,457,715.39
  5. Step 5: Solve for x
    x = 1,457,715.39/1,517.82
  6. Step 6: Final answer
    x = 960.40

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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.