Home / 1,207.08-1,669.86-979.56

Finding the Fourth Proportional to 1,207.08, 1,669.86 and 979.56

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Solution

The fourth proportional to 1,207.08, 1,669.86 and 979.56 is: 1,355.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.08 : 1,669.86 = 979.56 : x
  2. Step 2: Convert to fraction form
    1,207.08/1,669.86 = 979.56/x
  3. Step 3: Cross multiply
    1,207.08x = 1,669.86 × 979.56
  4. Step 4: Simplify right side
    1,207.08x = 1,635,728.06
  5. Step 5: Solve for x
    x = 1,635,728.06/1,207.08
  6. Step 6: Final answer
    x = 1,355.11

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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.