Home / 1,187.61-1,778.82-979.83

Finding the Fourth Proportional to 1,187.61, 1,778.82 and 979.83

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Solution

The fourth proportional to 1,187.61, 1,778.82 and 979.83 is: 1,467.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.61 : 1,778.82 = 979.83 : x
  2. Step 2: Convert to fraction form
    1,187.61/1,778.82 = 979.83/x
  3. Step 3: Cross multiply
    1,187.61x = 1,778.82 × 979.83
  4. Step 4: Simplify right side
    1,187.61x = 1,742,941.20
  5. Step 5: Solve for x
    x = 1,742,941.20/1,187.61
  6. Step 6: Final answer
    x = 1,467.60

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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.