Home / 1,212.06-1,670.98-931.20

Finding the Fourth Proportional to 1,212.06, 1,670.98 and 931.20

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Solution

The fourth proportional to 1,212.06, 1,670.98 and 931.20 is: 1,283.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.06 : 1,670.98 = 931.20 : x
  2. Step 2: Convert to fraction form
    1,212.06/1,670.98 = 931.20/x
  3. Step 3: Cross multiply
    1,212.06x = 1,670.98 × 931.20
  4. Step 4: Simplify right side
    1,212.06x = 1,556,009.73
  5. Step 5: Solve for x
    x = 1,556,009.73/1,212.06
  6. Step 6: Final answer
    x = 1,283.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.