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Finding the Fourth Proportional to 1,260.64, 1,890.96 and 394.80

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Solution

The fourth proportional to 1,260.64, 1,890.96 and 394.80 is: 592.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.64 : 1,890.96 = 394.80 : x
  2. Step 2: Convert to fraction form
    1,260.64/1,890.96 = 394.80/x
  3. Step 3: Cross multiply
    1,260.64x = 1,890.96 × 394.80
  4. Step 4: Simplify right side
    1,260.64x = 746,551.01
  5. Step 5: Solve for x
    x = 746,551.01/1,260.64
  6. Step 6: Final answer
    x = 592.20

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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.