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Finding the Fourth Proportional to 1,260.90, 1,889.46 and 713.21

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Solution

The fourth proportional to 1,260.90, 1,889.46 and 713.21 is: 1,068.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.90 : 1,889.46 = 713.21 : x
  2. Step 2: Convert to fraction form
    1,260.90/1,889.46 = 713.21/x
  3. Step 3: Cross multiply
    1,260.90x = 1,889.46 × 713.21
  4. Step 4: Simplify right side
    1,260.90x = 1,347,572.32
  5. Step 5: Solve for x
    x = 1,347,572.32/1,260.90
  6. Step 6: Final answer
    x = 1,068.74

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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.