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Finding the Fourth Proportional to 1,006.64, 1,392.36 and 890

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Solution

The fourth proportional to 1,006.64, 1,392.36 and 890 is: 1,231.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.64 : 1,392.36 = 890 : x
  2. Step 2: Convert to fraction form
    1,006.64/1,392.36 = 890/x
  3. Step 3: Cross multiply
    1,006.64x = 1,392.36 × 890
  4. Step 4: Simplify right side
    1,006.64x = 1,239,200.40
  5. Step 5: Solve for x
    x = 1,239,200.40/1,006.64
  6. Step 6: Final answer
    x = 1,231.03

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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.