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Finding the Fourth Proportional to 782.39, 1,172.76 and 371.04

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Solution

The fourth proportional to 782.39, 1,172.76 and 371.04 is: 556.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.39 : 1,172.76 = 371.04 : x
  2. Step 2: Convert to fraction form
    782.39/1,172.76 = 371.04/x
  3. Step 3: Cross multiply
    782.39x = 1,172.76 × 371.04
  4. Step 4: Simplify right side
    782.39x = 435,140.87
  5. Step 5: Solve for x
    x = 435,140.87/782.39
  6. Step 6: Final answer
    x = 556.17

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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.