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Finding the Fourth Proportional to 918.62, 1,267.05 and 861.98

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Solution

The fourth proportional to 918.62, 1,267.05 and 861.98 is: 1,188.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.62 : 1,267.05 = 861.98 : x
  2. Step 2: Convert to fraction form
    918.62/1,267.05 = 861.98/x
  3. Step 3: Cross multiply
    918.62x = 1,267.05 × 861.98
  4. Step 4: Simplify right side
    918.62x = 1,092,171.76
  5. Step 5: Solve for x
    x = 1,092,171.76/918.62
  6. Step 6: Final answer
    x = 1,188.93

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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.