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Finding the Fourth Proportional to 1,219.68, 1,683.15 and 660.15

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Solution

The fourth proportional to 1,219.68, 1,683.15 and 660.15 is: 911.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.68 : 1,683.15 = 660.15 : x
  2. Step 2: Convert to fraction form
    1,219.68/1,683.15 = 660.15/x
  3. Step 3: Cross multiply
    1,219.68x = 1,683.15 × 660.15
  4. Step 4: Simplify right side
    1,219.68x = 1,111,133.12
  5. Step 5: Solve for x
    x = 1,111,133.12/1,219.68
  6. Step 6: Final answer
    x = 911.00

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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.