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Finding the Fourth Proportional to 755.86, 1,133.79 and 208.05

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Solution

The fourth proportional to 755.86, 1,133.79 and 208.05 is: 312.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.86 : 1,133.79 = 208.05 : x
  2. Step 2: Convert to fraction form
    755.86/1,133.79 = 208.05/x
  3. Step 3: Cross multiply
    755.86x = 1,133.79 × 208.05
  4. Step 4: Simplify right side
    755.86x = 235,885.01
  5. Step 5: Solve for x
    x = 235,885.01/755.86
  6. Step 6: Final answer
    x = 312.08

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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.