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Finding the Fourth Proportional to 1,260.89, 1,891.12 and 480.86

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Solution

The fourth proportional to 1,260.89, 1,891.12 and 480.86 is: 721.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.89 : 1,891.12 = 480.86 : x
  2. Step 2: Convert to fraction form
    1,260.89/1,891.12 = 480.86/x
  3. Step 3: Cross multiply
    1,260.89x = 1,891.12 × 480.86
  4. Step 4: Simplify right side
    1,260.89x = 909,363.96
  5. Step 5: Solve for x
    x = 909,363.96/1,260.89
  6. Step 6: Final answer
    x = 721.21

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1.5x scale

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.