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Finding the Fourth Proportional to 741.17, 1,105.62 and 618.05

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Solution

The fourth proportional to 741.17, 1,105.62 and 618.05 is: 921.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.17 : 1,105.62 = 618.05 : x
  2. Step 2: Convert to fraction form
    741.17/1,105.62 = 618.05/x
  3. Step 3: Cross multiply
    741.17x = 1,105.62 × 618.05
  4. Step 4: Simplify right side
    741.17x = 683,328.44
  5. Step 5: Solve for x
    x = 683,328.44/741.17
  6. Step 6: Final answer
    x = 921.96

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.