Home / 1,214.30-1,821.54-392.55

Finding the Fourth Proportional to 1,214.30, 1,821.54 and 392.55

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Solution

The fourth proportional to 1,214.30, 1,821.54 and 392.55 is: 588.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.30 : 1,821.54 = 392.55 : x
  2. Step 2: Convert to fraction form
    1,214.30/1,821.54 = 392.55/x
  3. Step 3: Cross multiply
    1,214.30x = 1,821.54 × 392.55
  4. Step 4: Simplify right side
    1,214.30x = 715,045.53
  5. Step 5: Solve for x
    x = 715,045.53/1,214.30
  6. Step 6: Final answer
    x = 588.86

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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.