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Finding the Fourth Proportional to 1,222.99, 1,687.76 and 699.07

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Solution

The fourth proportional to 1,222.99, 1,687.76 and 699.07 is: 964.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.99 : 1,687.76 = 699.07 : x
  2. Step 2: Convert to fraction form
    1,222.99/1,687.76 = 699.07/x
  3. Step 3: Cross multiply
    1,222.99x = 1,687.76 × 699.07
  4. Step 4: Simplify right side
    1,222.99x = 1,179,862.38
  5. Step 5: Solve for x
    x = 1,179,862.38/1,222.99
  6. Step 6: Final answer
    x = 964.74

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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.