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Finding the Fourth Proportional to 699.54, 1,047.68 and 621.37

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Solution

The fourth proportional to 699.54, 1,047.68 and 621.37 is: 930.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.54 : 1,047.68 = 621.37 : x
  2. Step 2: Convert to fraction form
    699.54/1,047.68 = 621.37/x
  3. Step 3: Cross multiply
    699.54x = 1,047.68 × 621.37
  4. Step 4: Simplify right side
    699.54x = 650,996.92
  5. Step 5: Solve for x
    x = 650,996.92/699.54
  6. Step 6: Final answer
    x = 930.61

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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.