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Finding the Fourth Proportional to 1,294.60, 1,940.32 and 643.94

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Solution

The fourth proportional to 1,294.60, 1,940.32 and 643.94 is: 965.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.60 : 1,940.32 = 643.94 : x
  2. Step 2: Convert to fraction form
    1,294.60/1,940.32 = 643.94/x
  3. Step 3: Cross multiply
    1,294.60x = 1,940.32 × 643.94
  4. Step 4: Simplify right side
    1,294.60x = 1,249,449.66
  5. Step 5: Solve for x
    x = 1,249,449.66/1,294.60
  6. Step 6: Final answer
    x = 965.12

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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.