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Finding the Fourth Proportional to 930.92, 1,394.96 and 621.63

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Solution

The fourth proportional to 930.92, 1,394.96 and 621.63 is: 931.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.92 : 1,394.96 = 621.63 : x
  2. Step 2: Convert to fraction form
    930.92/1,394.96 = 621.63/x
  3. Step 3: Cross multiply
    930.92x = 1,394.96 × 621.63
  4. Step 4: Simplify right side
    930.92x = 867,145.88
  5. Step 5: Solve for x
    x = 867,145.88/930.92
  6. Step 6: Final answer
    x = 931.50

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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.