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Finding the Fourth Proportional to 1,269.02, 1,902.80 and 684.70

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Solution

The fourth proportional to 1,269.02, 1,902.80 and 684.70 is: 1,026.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.02 : 1,902.80 = 684.70 : x
  2. Step 2: Convert to fraction form
    1,269.02/1,902.80 = 684.70/x
  3. Step 3: Cross multiply
    1,269.02x = 1,902.80 × 684.70
  4. Step 4: Simplify right side
    1,269.02x = 1,302,847.16
  5. Step 5: Solve for x
    x = 1,302,847.16/1,269.02
  6. Step 6: Final answer
    x = 1,026.66

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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.