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Finding the Fourth Proportional to 1,260.89, 1,891.35 and 611.46

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Solution

The fourth proportional to 1,260.89, 1,891.35 and 611.46 is: 917.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.89 : 1,891.35 = 611.46 : x
  2. Step 2: Convert to fraction form
    1,260.89/1,891.35 = 611.46/x
  3. Step 3: Cross multiply
    1,260.89x = 1,891.35 × 611.46
  4. Step 4: Simplify right side
    1,260.89x = 1,156,484.87
  5. Step 5: Solve for x
    x = 1,156,484.87/1,260.89
  6. Step 6: Final answer
    x = 917.20

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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.