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Finding the Fourth Proportional to 1,269.80, 1,904.67 and 620.40

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Solution

The fourth proportional to 1,269.80, 1,904.67 and 620.40 is: 930.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.80 : 1,904.67 = 620.40 : x
  2. Step 2: Convert to fraction form
    1,269.80/1,904.67 = 620.40/x
  3. Step 3: Cross multiply
    1,269.80x = 1,904.67 × 620.40
  4. Step 4: Simplify right side
    1,269.80x = 1,181,657.27
  5. Step 5: Solve for x
    x = 1,181,657.27/1,269.80
  6. Step 6: Final answer
    x = 930.59

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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.