Home / 1,215.54-1,688.76-1,200.96

Finding the Fourth Proportional to 1,215.54, 1,688.76 and 1,200.96

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Solution

The fourth proportional to 1,215.54, 1,688.76 and 1,200.96 is: 1,668.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.54 : 1,688.76 = 1,200.96 : x
  2. Step 2: Convert to fraction form
    1,215.54/1,688.76 = 1,200.96/x
  3. Step 3: Cross multiply
    1,215.54x = 1,688.76 × 1,200.96
  4. Step 4: Simplify right side
    1,215.54x = 2,028,133.21
  5. Step 5: Solve for x
    x = 2,028,133.21/1,215.54
  6. Step 6: Final answer
    x = 1,668.50

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.