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Finding the Fourth Proportional to 1,172.29, 1,617.37 and 774.15

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Solution

The fourth proportional to 1,172.29, 1,617.37 and 774.15 is: 1,068.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.29 : 1,617.37 = 774.15 : x
  2. Step 2: Convert to fraction form
    1,172.29/1,617.37 = 774.15/x
  3. Step 3: Cross multiply
    1,172.29x = 1,617.37 × 774.15
  4. Step 4: Simplify right side
    1,172.29x = 1,252,083.11
  5. Step 5: Solve for x
    x = 1,252,083.11/1,172.29
  6. Step 6: Final answer
    x = 1,068.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.