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Finding the Fourth Proportional to 1,319.69, 1,821.15 and 722.16

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Solution

The fourth proportional to 1,319.69, 1,821.15 and 722.16 is: 996.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.69 : 1,821.15 = 722.16 : x
  2. Step 2: Convert to fraction form
    1,319.69/1,821.15 = 722.16/x
  3. Step 3: Cross multiply
    1,319.69x = 1,821.15 × 722.16
  4. Step 4: Simplify right side
    1,319.69x = 1,315,161.68
  5. Step 5: Solve for x
    x = 1,315,161.68/1,319.69
  6. Step 6: Final answer
    x = 996.57

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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.