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Finding the Fourth Proportional to 930.43, 1,284.11 and 557.41

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Solution

The fourth proportional to 930.43, 1,284.11 and 557.41 is: 769.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.43 : 1,284.11 = 557.41 : x
  2. Step 2: Convert to fraction form
    930.43/1,284.11 = 557.41/x
  3. Step 3: Cross multiply
    930.43x = 1,284.11 × 557.41
  4. Step 4: Simplify right side
    930.43x = 715,775.76
  5. Step 5: Solve for x
    x = 715,775.76/930.43
  6. Step 6: Final answer
    x = 769.30

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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.