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Finding the Fourth Proportional to 744.68, 1,115.19 and 608.60

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Solution

The fourth proportional to 744.68, 1,115.19 and 608.60 is: 911.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.68 : 1,115.19 = 608.60 : x
  2. Step 2: Convert to fraction form
    744.68/1,115.19 = 608.60/x
  3. Step 3: Cross multiply
    744.68x = 1,115.19 × 608.60
  4. Step 4: Simplify right side
    744.68x = 678,699.06
  5. Step 5: Solve for x
    x = 678,699.06/744.68
  6. Step 6: Final answer
    x = 911.40

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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.