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Finding the Fourth Proportional to 1,433.18, 1,978.21 and 935.90

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Solution

The fourth proportional to 1,433.18, 1,978.21 and 935.90 is: 1,291.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,433.18 : 1,978.21 = 935.90 : x
  2. Step 2: Convert to fraction form
    1,433.18/1,978.21 = 935.90/x
  3. Step 3: Cross multiply
    1,433.18x = 1,978.21 × 935.90
  4. Step 4: Simplify right side
    1,433.18x = 1,851,405.44
  5. Step 5: Solve for x
    x = 1,851,405.44/1,433.18
  6. Step 6: Final answer
    x = 1,291.81

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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.