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Finding the Fourth Proportional to 1,208.87, 1,668.02 and 711.53

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Solution

The fourth proportional to 1,208.87, 1,668.02 and 711.53 is: 981.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.87 : 1,668.02 = 711.53 : x
  2. Step 2: Convert to fraction form
    1,208.87/1,668.02 = 711.53/x
  3. Step 3: Cross multiply
    1,208.87x = 1,668.02 × 711.53
  4. Step 4: Simplify right side
    1,208.87x = 1,186,834.37
  5. Step 5: Solve for x
    x = 1,186,834.37/1,208.87
  6. Step 6: Final answer
    x = 981.78

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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.