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Finding the Fourth Proportional to 918.49, 1,267.32 and 669.87

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Solution

The fourth proportional to 918.49, 1,267.32 and 669.87 is: 924.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.49 : 1,267.32 = 669.87 : x
  2. Step 2: Convert to fraction form
    918.49/1,267.32 = 669.87/x
  3. Step 3: Cross multiply
    918.49x = 1,267.32 × 669.87
  4. Step 4: Simplify right side
    918.49x = 848,940.28
  5. Step 5: Solve for x
    x = 848,940.28/918.49
  6. Step 6: Final answer
    x = 924.28

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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.