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Finding the Fourth Proportional to 1,208.34, 1,667.91 and 711.12

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Solution

The fourth proportional to 1,208.34, 1,667.91 and 711.12 is: 981.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.34 : 1,667.91 = 711.12 : x
  2. Step 2: Convert to fraction form
    1,208.34/1,667.91 = 711.12/x
  3. Step 3: Cross multiply
    1,208.34x = 1,667.91 × 711.12
  4. Step 4: Simplify right side
    1,208.34x = 1,186,093.08
  5. Step 5: Solve for x
    x = 1,186,093.08/1,208.34
  6. Step 6: Final answer
    x = 981.59

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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.