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Finding the Fourth Proportional to 1,269.31, 1,903.65 and 403.42

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Solution

The fourth proportional to 1,269.31, 1,903.65 and 403.42 is: 605.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.31 : 1,903.65 = 403.42 : x
  2. Step 2: Convert to fraction form
    1,269.31/1,903.65 = 403.42/x
  3. Step 3: Cross multiply
    1,269.31x = 1,903.65 × 403.42
  4. Step 4: Simplify right side
    1,269.31x = 767,970.48
  5. Step 5: Solve for x
    x = 767,970.48/1,269.31
  6. Step 6: Final answer
    x = 605.03

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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.