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Finding the Fourth Proportional to 744.56, 1,115.28 and 620.60

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Solution

The fourth proportional to 744.56, 1,115.28 and 620.60 is: 929.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.56 : 1,115.28 = 620.60 : x
  2. Step 2: Convert to fraction form
    744.56/1,115.28 = 620.60/x
  3. Step 3: Cross multiply
    744.56x = 1,115.28 × 620.60
  4. Step 4: Simplify right side
    744.56x = 692,142.77
  5. Step 5: Solve for x
    x = 692,142.77/744.56
  6. Step 6: Final answer
    x = 929.60

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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.