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Finding the Fourth Proportional to 1,355.98, 2,033.40 and 431.29

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Solution

The fourth proportional to 1,355.98, 2,033.40 and 431.29 is: 646.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.98 : 2,033.40 = 431.29 : x
  2. Step 2: Convert to fraction form
    1,355.98/2,033.40 = 431.29/x
  3. Step 3: Cross multiply
    1,355.98x = 2,033.40 × 431.29
  4. Step 4: Simplify right side
    1,355.98x = 876,985.09
  5. Step 5: Solve for x
    x = 876,985.09/1,355.98
  6. Step 6: Final answer
    x = 646.75

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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.