Home / 1,207.39-1,811.40-427.36

Finding the Fourth Proportional to 1,207.39, 1,811.40 and 427.36

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Solution

The fourth proportional to 1,207.39, 1,811.40 and 427.36 is: 641.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.39 : 1,811.40 = 427.36 : x
  2. Step 2: Convert to fraction form
    1,207.39/1,811.40 = 427.36/x
  3. Step 3: Cross multiply
    1,207.39x = 1,811.40 × 427.36
  4. Step 4: Simplify right side
    1,207.39x = 774,119.90
  5. Step 5: Solve for x
    x = 774,119.90/1,207.39
  6. Step 6: Final answer
    x = 641.15

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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.