Home / 1,212.65-1,819.10-390.73

Finding the Fourth Proportional to 1,212.65, 1,819.10 and 390.73

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Solution

The fourth proportional to 1,212.65, 1,819.10 and 390.73 is: 586.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.65 : 1,819.10 = 390.73 : x
  2. Step 2: Convert to fraction form
    1,212.65/1,819.10 = 390.73/x
  3. Step 3: Cross multiply
    1,212.65x = 1,819.10 × 390.73
  4. Step 4: Simplify right side
    1,212.65x = 710,776.94
  5. Step 5: Solve for x
    x = 710,776.94/1,212.65
  6. Step 6: Final answer
    x = 586.14

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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.