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Finding the Fourth Proportional to 667.46, 919.62 and 498.68

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Solution

The fourth proportional to 667.46, 919.62 and 498.68 is: 687.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.46 : 919.62 = 498.68 : x
  2. Step 2: Convert to fraction form
    667.46/919.62 = 498.68/x
  3. Step 3: Cross multiply
    667.46x = 919.62 × 498.68
  4. Step 4: Simplify right side
    667.46x = 458,596.10
  5. Step 5: Solve for x
    x = 458,596.10/667.46
  6. Step 6: Final answer
    x = 687.08

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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.