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Finding the Fourth Proportional to 918.26, 1,267.35 and 887.88

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Solution

The fourth proportional to 918.26, 1,267.35 and 887.88 is: 1,225.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.26 : 1,267.35 = 887.88 : x
  2. Step 2: Convert to fraction form
    918.26/1,267.35 = 887.88/x
  3. Step 3: Cross multiply
    918.26x = 1,267.35 × 887.88
  4. Step 4: Simplify right side
    918.26x = 1,125,257.89
  5. Step 5: Solve for x
    x = 1,125,257.89/918.26
  6. Step 6: Final answer
    x = 1,225.43

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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.