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Finding the Fourth Proportional to 1,199.94, 1,658.34 and 905.10

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Solution

The fourth proportional to 1,199.94, 1,658.34 and 905.10 is: 1,250.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,199.94 : 1,658.34 = 905.10 : x
  2. Step 2: Convert to fraction form
    1,199.94/1,658.34 = 905.10/x
  3. Step 3: Cross multiply
    1,199.94x = 1,658.34 × 905.10
  4. Step 4: Simplify right side
    1,199.94x = 1,500,963.53
  5. Step 5: Solve for x
    x = 1,500,963.53/1,199.94
  6. Step 6: Final answer
    x = 1,250.87

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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.