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Finding the Fourth Proportional to 1,269.21, 1,903.32 and 488.78

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Solution

The fourth proportional to 1,269.21, 1,903.32 and 488.78 is: 732.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.21 : 1,903.32 = 488.78 : x
  2. Step 2: Convert to fraction form
    1,269.21/1,903.32 = 488.78/x
  3. Step 3: Cross multiply
    1,269.21x = 1,903.32 × 488.78
  4. Step 4: Simplify right side
    1,269.21x = 930,311.36
  5. Step 5: Solve for x
    x = 930,311.36/1,269.21
  6. Step 6: Final answer
    x = 732.98

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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.