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Finding the Fourth Proportional to 762.57, 1,143.89 and 214.79

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Solution

The fourth proportional to 762.57, 1,143.89 and 214.79 is: 322.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.57 : 1,143.89 = 214.79 : x
  2. Step 2: Convert to fraction form
    762.57/1,143.89 = 214.79/x
  3. Step 3: Cross multiply
    762.57x = 1,143.89 × 214.79
  4. Step 4: Simplify right side
    762.57x = 245,696.13
  5. Step 5: Solve for x
    x = 245,696.13/762.57
  6. Step 6: Final answer
    x = 322.19

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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.