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Finding the Fourth Proportional to 1,372.54, 2,056.89 and 640.30

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Solution

The fourth proportional to 1,372.54, 2,056.89 and 640.30 is: 959.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.54 : 2,056.89 = 640.30 : x
  2. Step 2: Convert to fraction form
    1,372.54/2,056.89 = 640.30/x
  3. Step 3: Cross multiply
    1,372.54x = 2,056.89 × 640.30
  4. Step 4: Simplify right side
    1,372.54x = 1,317,026.67
  5. Step 5: Solve for x
    x = 1,317,026.67/1,372.54
  6. Step 6: Final answer
    x = 959.55

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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.