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Finding the Fourth Proportional to 1,206.99, 1,666.04 and 857.07

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Solution

The fourth proportional to 1,206.99, 1,666.04 and 857.07 is: 1,183.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.99 : 1,666.04 = 857.07 : x
  2. Step 2: Convert to fraction form
    1,206.99/1,666.04 = 857.07/x
  3. Step 3: Cross multiply
    1,206.99x = 1,666.04 × 857.07
  4. Step 4: Simplify right side
    1,206.99x = 1,427,908.62
  5. Step 5: Solve for x
    x = 1,427,908.62/1,206.99
  6. Step 6: Final answer
    x = 1,183.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.