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Finding the Fourth Proportional to 893.18, 1,230.62 and 668.18

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Solution

The fourth proportional to 893.18, 1,230.62 and 668.18 is: 920.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.18 : 1,230.62 = 668.18 : x
  2. Step 2: Convert to fraction form
    893.18/1,230.62 = 668.18/x
  3. Step 3: Cross multiply
    893.18x = 1,230.62 × 668.18
  4. Step 4: Simplify right side
    893.18x = 822,275.67
  5. Step 5: Solve for x
    x = 822,275.67/893.18
  6. Step 6: Final answer
    x = 920.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.