Home / 1,209.24-1,815.30-778.20

Finding the Fourth Proportional to 1,209.24, 1,815.30 and 778.20

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Solution

The fourth proportional to 1,209.24, 1,815.30 and 778.20 is: 1,168.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.24 : 1,815.30 = 778.20 : x
  2. Step 2: Convert to fraction form
    1,209.24/1,815.30 = 778.20/x
  3. Step 3: Cross multiply
    1,209.24x = 1,815.30 × 778.20
  4. Step 4: Simplify right side
    1,209.24x = 1,412,666.46
  5. Step 5: Solve for x
    x = 1,412,666.46/1,209.24
  6. Step 6: Final answer
    x = 1,168.23

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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.