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Finding the Fourth Proportional to 1,219.79, 1,683.63 and 722.58

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Solution

The fourth proportional to 1,219.79, 1,683.63 and 722.58 is: 997.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.79 : 1,683.63 = 722.58 : x
  2. Step 2: Convert to fraction form
    1,219.79/1,683.63 = 722.58/x
  3. Step 3: Cross multiply
    1,219.79x = 1,683.63 × 722.58
  4. Step 4: Simplify right side
    1,219.79x = 1,216,557.37
  5. Step 5: Solve for x
    x = 1,216,557.37/1,219.79
  6. Step 6: Final answer
    x = 997.35

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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.