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Finding the Fourth Proportional to 1,208.40, 1,667.64 and 742.80

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Solution

The fourth proportional to 1,208.40, 1,667.64 and 742.80 is: 1,025.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.40 : 1,667.64 = 742.80 : x
  2. Step 2: Convert to fraction form
    1,208.40/1,667.64 = 742.80/x
  3. Step 3: Cross multiply
    1,208.40x = 1,667.64 × 742.80
  4. Step 4: Simplify right side
    1,208.40x = 1,238,722.99
  5. Step 5: Solve for x
    x = 1,238,722.99/1,208.40
  6. Step 6: Final answer
    x = 1,025.09

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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.