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Finding the Fourth Proportional to 801.70, 1,201.68 and 389.92

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Solution

The fourth proportional to 801.70, 1,201.68 and 389.92 is: 584.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.70 : 1,201.68 = 389.92 : x
  2. Step 2: Convert to fraction form
    801.70/1,201.68 = 389.92/x
  3. Step 3: Cross multiply
    801.70x = 1,201.68 × 389.92
  4. Step 4: Simplify right side
    801.70x = 468,559.07
  5. Step 5: Solve for x
    x = 468,559.07/801.70
  6. Step 6: Final answer
    x = 584.46

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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.