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Finding the Fourth Proportional to 1,445.40, 2,168.07 and 405.41

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Solution

The fourth proportional to 1,445.40, 2,168.07 and 405.41 is: 608.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,445.40 : 2,168.07 = 405.41 : x
  2. Step 2: Convert to fraction form
    1,445.40/2,168.07 = 405.41/x
  3. Step 3: Cross multiply
    1,445.40x = 2,168.07 × 405.41
  4. Step 4: Simplify right side
    1,445.40x = 878,963.19
  5. Step 5: Solve for x
    x = 878,963.19/1,445.40
  6. Step 6: Final answer
    x = 608.11

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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.