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Finding the Fourth Proportional to 918.49, 1,368.97 and 866.60

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Solution

The fourth proportional to 918.49, 1,368.97 and 866.60 is: 1,291.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.49 : 1,368.97 = 866.60 : x
  2. Step 2: Convert to fraction form
    918.49/1,368.97 = 866.60/x
  3. Step 3: Cross multiply
    918.49x = 1,368.97 × 866.60
  4. Step 4: Simplify right side
    918.49x = 1,186,342.56
  5. Step 5: Solve for x
    x = 1,186,342.56/918.49
  6. Step 6: Final answer
    x = 1,291.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.