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Finding the Fourth Proportional to 1,319.43, 1,820.82 and 721.94

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Solution

The fourth proportional to 1,319.43, 1,820.82 and 721.94 is: 996.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.43 : 1,820.82 = 721.94 : x
  2. Step 2: Convert to fraction form
    1,319.43/1,820.82 = 721.94/x
  3. Step 3: Cross multiply
    1,319.43x = 1,820.82 × 721.94
  4. Step 4: Simplify right side
    1,319.43x = 1,314,522.79
  5. Step 5: Solve for x
    x = 1,314,522.79/1,319.43
  6. Step 6: Final answer
    x = 996.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.