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Finding the Fourth Proportional to 930.78, 1,283.90 and 772.49

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Solution

The fourth proportional to 930.78, 1,283.90 and 772.49 is: 1,065.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.78 : 1,283.90 = 772.49 : x
  2. Step 2: Convert to fraction form
    930.78/1,283.90 = 772.49/x
  3. Step 3: Cross multiply
    930.78x = 1,283.90 × 772.49
  4. Step 4: Simplify right side
    930.78x = 991,789.63
  5. Step 5: Solve for x
    x = 991,789.63/930.78
  6. Step 6: Final answer
    x = 1,065.55

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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.