Home / 1,214.49-1,821.72-392.75

Finding the Fourth Proportional to 1,214.49, 1,821.72 and 392.75

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Solution

The fourth proportional to 1,214.49, 1,821.72 and 392.75 is: 589.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.49 : 1,821.72 = 392.75 : x
  2. Step 2: Convert to fraction form
    1,214.49/1,821.72 = 392.75/x
  3. Step 3: Cross multiply
    1,214.49x = 1,821.72 × 392.75
  4. Step 4: Simplify right side
    1,214.49x = 715,472.89
  5. Step 5: Solve for x
    x = 715,472.89/1,214.49
  6. Step 6: Final answer
    x = 589.11

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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.