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Finding the Fourth Proportional to 947.58, 1,420.56 and 622.23

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Solution

The fourth proportional to 947.58, 1,420.56 and 622.23 is: 932.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.58 : 1,420.56 = 622.23 : x
  2. Step 2: Convert to fraction form
    947.58/1,420.56 = 622.23/x
  3. Step 3: Cross multiply
    947.58x = 1,420.56 × 622.23
  4. Step 4: Simplify right side
    947.58x = 883,915.05
  5. Step 5: Solve for x
    x = 883,915.05/947.58
  6. Step 6: Final answer
    x = 932.81

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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.