Home / 1,212.04-1,818.30-778.60

Finding the Fourth Proportional to 1,212.04, 1,818.30 and 778.60

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Solution

The fourth proportional to 1,212.04, 1,818.30 and 778.60 is: 1,168.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.04 : 1,818.30 = 778.60 : x
  2. Step 2: Convert to fraction form
    1,212.04/1,818.30 = 778.60/x
  3. Step 3: Cross multiply
    1,212.04x = 1,818.30 × 778.60
  4. Step 4: Simplify right side
    1,212.04x = 1,415,728.38
  5. Step 5: Solve for x
    x = 1,415,728.38/1,212.04
  6. Step 6: Final answer
    x = 1,168.05

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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.