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Finding the Fourth Proportional to 917.06, 1,372.56 and 620.18

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Solution

The fourth proportional to 917.06, 1,372.56 and 620.18 is: 928.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.06 : 1,372.56 = 620.18 : x
  2. Step 2: Convert to fraction form
    917.06/1,372.56 = 620.18/x
  3. Step 3: Cross multiply
    917.06x = 1,372.56 × 620.18
  4. Step 4: Simplify right side
    917.06x = 851,234.26
  5. Step 5: Solve for x
    x = 851,234.26/917.06
  6. Step 6: Final answer
    x = 928.22

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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.