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Finding the Fourth Proportional to 1,206.77, 1,809.39 and 678.81

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Solution

The fourth proportional to 1,206.77, 1,809.39 and 678.81 is: 1,017.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.77 : 1,809.39 = 678.81 : x
  2. Step 2: Convert to fraction form
    1,206.77/1,809.39 = 678.81/x
  3. Step 3: Cross multiply
    1,206.77x = 1,809.39 × 678.81
  4. Step 4: Simplify right side
    1,206.77x = 1,228,231.18
  5. Step 5: Solve for x
    x = 1,228,231.18/1,206.77
  6. Step 6: Final answer
    x = 1,017.79

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1.5x scale

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.