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Finding the Fourth Proportional to 918.21, 1,267.11 and 498.54

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Solution

The fourth proportional to 918.21, 1,267.11 and 498.54 is: 687.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.21 : 1,267.11 = 498.54 : x
  2. Step 2: Convert to fraction form
    918.21/1,267.11 = 498.54/x
  3. Step 3: Cross multiply
    918.21x = 1,267.11 × 498.54
  4. Step 4: Simplify right side
    918.21x = 631,705.69
  5. Step 5: Solve for x
    x = 631,705.69/918.21
  6. Step 6: Final answer
    x = 687.98

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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.