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Finding the Fourth Proportional to 1,207.99, 1,665.75 and 912.79

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Solution

The fourth proportional to 1,207.99, 1,665.75 and 912.79 is: 1,258.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.99 : 1,665.75 = 912.79 : x
  2. Step 2: Convert to fraction form
    1,207.99/1,665.75 = 912.79/x
  3. Step 3: Cross multiply
    1,207.99x = 1,665.75 × 912.79
  4. Step 4: Simplify right side
    1,207.99x = 1,520,479.94
  5. Step 5: Solve for x
    x = 1,520,479.94/1,207.99
  6. Step 6: Final answer
    x = 1,258.69

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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.