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Finding the Fourth Proportional to 1,153.63, 1,728.82 and 762.99

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Solution

The fourth proportional to 1,153.63, 1,728.82 and 762.99 is: 1,143.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.63 : 1,728.82 = 762.99 : x
  2. Step 2: Convert to fraction form
    1,153.63/1,728.82 = 762.99/x
  3. Step 3: Cross multiply
    1,153.63x = 1,728.82 × 762.99
  4. Step 4: Simplify right side
    1,153.63x = 1,319,072.37
  5. Step 5: Solve for x
    x = 1,319,072.37/1,153.63
  6. Step 6: Final answer
    x = 1,143.41

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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.