Home / 1,214.65-1,821.79-392.99

Finding the Fourth Proportional to 1,214.65, 1,821.79 and 392.99

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Solution

The fourth proportional to 1,214.65, 1,821.79 and 392.99 is: 589.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.65 : 1,821.79 = 392.99 : x
  2. Step 2: Convert to fraction form
    1,214.65/1,821.79 = 392.99/x
  3. Step 3: Cross multiply
    1,214.65x = 1,821.79 × 392.99
  4. Step 4: Simplify right side
    1,214.65x = 715,945.25
  5. Step 5: Solve for x
    x = 715,945.25/1,214.65
  6. Step 6: Final answer
    x = 589.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.