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Finding the Fourth Proportional to 781.41, 1,172.67 and 576.51

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Solution

The fourth proportional to 781.41, 1,172.67 and 576.51 is: 865.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.41 : 1,172.67 = 576.51 : x
  2. Step 2: Convert to fraction form
    781.41/1,172.67 = 576.51/x
  3. Step 3: Cross multiply
    781.41x = 1,172.67 × 576.51
  4. Step 4: Simplify right side
    781.41x = 676,055.98
  5. Step 5: Solve for x
    x = 676,055.98/781.41
  6. Step 6: Final answer
    x = 865.17

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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.