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Finding the Fourth Proportional to 780.72, 1,172.91 and 671.37

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Solution

The fourth proportional to 780.72, 1,172.91 and 671.37 is: 1,008.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.72 : 1,172.91 = 671.37 : x
  2. Step 2: Convert to fraction form
    780.72/1,172.91 = 671.37/x
  3. Step 3: Cross multiply
    780.72x = 1,172.91 × 671.37
  4. Step 4: Simplify right side
    780.72x = 787,453.23
  5. Step 5: Solve for x
    x = 787,453.23/780.72
  6. Step 6: Final answer
    x = 1,008.62

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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.