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Finding the Fourth Proportional to 930.48, 1,389.18 and 768.48

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Solution

The fourth proportional to 930.48, 1,389.18 and 768.48 is: 1,147.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.48 : 1,389.18 = 768.48 : x
  2. Step 2: Convert to fraction form
    930.48/1,389.18 = 768.48/x
  3. Step 3: Cross multiply
    930.48x = 1,389.18 × 768.48
  4. Step 4: Simplify right side
    930.48x = 1,067,557.05
  5. Step 5: Solve for x
    x = 1,067,557.05/930.48
  6. Step 6: Final answer
    x = 1,147.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.