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Finding the Fourth Proportional to 930.76, 1,394.96 and 519.30

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Solution

The fourth proportional to 930.76, 1,394.96 and 519.30 is: 778.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.76 : 1,394.96 = 519.30 : x
  2. Step 2: Convert to fraction form
    930.76/1,394.96 = 519.30/x
  3. Step 3: Cross multiply
    930.76x = 1,394.96 × 519.30
  4. Step 4: Simplify right side
    930.76x = 724,400.13
  5. Step 5: Solve for x
    x = 724,400.13/930.76
  6. Step 6: Final answer
    x = 778.29

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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.