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Finding the Fourth Proportional to 930.44, 1,392.62 and 518.55

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Solution

The fourth proportional to 930.44, 1,392.62 and 518.55 is: 776.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.44 : 1,392.62 = 518.55 : x
  2. Step 2: Convert to fraction form
    930.44/1,392.62 = 518.55/x
  3. Step 3: Cross multiply
    930.44x = 1,392.62 × 518.55
  4. Step 4: Simplify right side
    930.44x = 722,140.51
  5. Step 5: Solve for x
    x = 722,140.51/930.44
  6. Step 6: Final answer
    x = 776.13

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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.