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Finding the Fourth Proportional to 1,374.14, 2,059.77 and 643.12

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Solution

The fourth proportional to 1,374.14, 2,059.77 and 643.12 is: 964.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,374.14 : 2,059.77 = 643.12 : x
  2. Step 2: Convert to fraction form
    1,374.14/2,059.77 = 643.12/x
  3. Step 3: Cross multiply
    1,374.14x = 2,059.77 × 643.12
  4. Step 4: Simplify right side
    1,374.14x = 1,324,679.28
  5. Step 5: Solve for x
    x = 1,324,679.28/1,374.14
  6. Step 6: Final answer
    x = 964.01

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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.