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Finding the Fourth Proportional to 1,172.86, 1,618.59 and 758.86

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Solution

The fourth proportional to 1,172.86, 1,618.59 and 758.86 is: 1,047.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.86 : 1,618.59 = 758.86 : x
  2. Step 2: Convert to fraction form
    1,172.86/1,618.59 = 758.86/x
  3. Step 3: Cross multiply
    1,172.86x = 1,618.59 × 758.86
  4. Step 4: Simplify right side
    1,172.86x = 1,228,283.21
  5. Step 5: Solve for x
    x = 1,228,283.21/1,172.86
  6. Step 6: Final answer
    x = 1,047.25

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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.