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Finding the Fourth Proportional to 1,260.72, 1,890.90 and 712.80

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Solution

The fourth proportional to 1,260.72, 1,890.90 and 712.80 is: 1,069.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.72 : 1,890.90 = 712.80 : x
  2. Step 2: Convert to fraction form
    1,260.72/1,890.90 = 712.80/x
  3. Step 3: Cross multiply
    1,260.72x = 1,890.90 × 712.80
  4. Step 4: Simplify right side
    1,260.72x = 1,347,833.52
  5. Step 5: Solve for x
    x = 1,347,833.52/1,260.72
  6. Step 6: Final answer
    x = 1,069.10

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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.