Home / 1,212.06-1,817.46-431.76

Finding the Fourth Proportional to 1,212.06, 1,817.46 and 431.76

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Solution

The fourth proportional to 1,212.06, 1,817.46 and 431.76 is: 647.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.06 : 1,817.46 = 431.76 : x
  2. Step 2: Convert to fraction form
    1,212.06/1,817.46 = 431.76/x
  3. Step 3: Cross multiply
    1,212.06x = 1,817.46 × 431.76
  4. Step 4: Simplify right side
    1,212.06x = 784,706.53
  5. Step 5: Solve for x
    x = 784,706.53/1,212.06
  6. Step 6: Final answer
    x = 647.42

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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.