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Finding the Fourth Proportional to 930.31, 1,283.78 and 557.21

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Solution

The fourth proportional to 930.31, 1,283.78 and 557.21 is: 768.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.31 : 1,283.78 = 557.21 : x
  2. Step 2: Convert to fraction form
    930.31/1,283.78 = 557.21/x
  3. Step 3: Cross multiply
    930.31x = 1,283.78 × 557.21
  4. Step 4: Simplify right side
    930.31x = 715,326.89
  5. Step 5: Solve for x
    x = 715,326.89/930.31
  6. Step 6: Final answer
    x = 768.91

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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.