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Finding the Fourth Proportional to 756.71, 1,134.86 and 208.76

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Solution

The fourth proportional to 756.71, 1,134.86 and 208.76 is: 313.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.71 : 1,134.86 = 208.76 : x
  2. Step 2: Convert to fraction form
    756.71/1,134.86 = 208.76/x
  3. Step 3: Cross multiply
    756.71x = 1,134.86 × 208.76
  4. Step 4: Simplify right side
    756.71x = 236,913.37
  5. Step 5: Solve for x
    x = 236,913.37/756.71
  6. Step 6: Final answer
    x = 313.08

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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.