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Finding the Fourth Proportional to 1,321.72, 1,980.96 and 705.58

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Solution

The fourth proportional to 1,321.72, 1,980.96 and 705.58 is: 1,057.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.72 : 1,980.96 = 705.58 : x
  2. Step 2: Convert to fraction form
    1,321.72/1,980.96 = 705.58/x
  3. Step 3: Cross multiply
    1,321.72x = 1,980.96 × 705.58
  4. Step 4: Simplify right side
    1,321.72x = 1,397,725.76
  5. Step 5: Solve for x
    x = 1,397,725.76/1,321.72
  6. Step 6: Final answer
    x = 1,057.51

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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.