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Finding the Fourth Proportional to 1,219.98, 1,683.48 and 722.64

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Solution

The fourth proportional to 1,219.98, 1,683.48 and 722.64 is: 997.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.98 : 1,683.48 = 722.64 : x
  2. Step 2: Convert to fraction form
    1,219.98/1,683.48 = 722.64/x
  3. Step 3: Cross multiply
    1,219.98x = 1,683.48 × 722.64
  4. Step 4: Simplify right side
    1,219.98x = 1,216,549.99
  5. Step 5: Solve for x
    x = 1,216,549.99/1,219.98
  6. Step 6: Final answer
    x = 997.19

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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.