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Finding the Fourth Proportional to 762.90, 1,143.40 and 351.96

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Solution

The fourth proportional to 762.90, 1,143.40 and 351.96 is: 527.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.90 : 1,143.40 = 351.96 : x
  2. Step 2: Convert to fraction form
    762.90/1,143.40 = 351.96/x
  3. Step 3: Cross multiply
    762.90x = 1,143.40 × 351.96
  4. Step 4: Simplify right side
    762.90x = 402,431.06
  5. Step 5: Solve for x
    x = 402,431.06/762.90
  6. Step 6: Final answer
    x = 527.50

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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.