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Finding the Fourth Proportional to 668.90, 922.98 and 403.28

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Solution

The fourth proportional to 668.90, 922.98 and 403.28 is: 556.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.90 : 922.98 = 403.28 : x
  2. Step 2: Convert to fraction form
    668.90/922.98 = 403.28/x
  3. Step 3: Cross multiply
    668.90x = 922.98 × 403.28
  4. Step 4: Simplify right side
    668.90x = 372,219.37
  5. Step 5: Solve for x
    x = 372,219.37/668.90
  6. Step 6: Final answer
    x = 556.46

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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.