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Finding the Fourth Proportional to 918.60, 1,267.66 and 504.60

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Solution

The fourth proportional to 918.60, 1,267.66 and 504.60 is: 696.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.60 : 1,267.66 = 504.60 : x
  2. Step 2: Convert to fraction form
    918.60/1,267.66 = 504.60/x
  3. Step 3: Cross multiply
    918.60x = 1,267.66 × 504.60
  4. Step 4: Simplify right side
    918.60x = 639,661.24
  5. Step 5: Solve for x
    x = 639,661.24/918.60
  6. Step 6: Final answer
    x = 696.34

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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.