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Finding the Fourth Proportional to 891.66, 1,230.19 and 518.33

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Solution

The fourth proportional to 891.66, 1,230.19 and 518.33 is: 715.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.66 : 1,230.19 = 518.33 : x
  2. Step 2: Convert to fraction form
    891.66/1,230.19 = 518.33/x
  3. Step 3: Cross multiply
    891.66x = 1,230.19 × 518.33
  4. Step 4: Simplify right side
    891.66x = 637,643.57
  5. Step 5: Solve for x
    x = 637,643.57/891.66
  6. Step 6: Final answer
    x = 715.12

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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.