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Finding the Fourth Proportional to 668.30, 922.36 and 402.86

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Solution

The fourth proportional to 668.30, 922.36 and 402.86 is: 556.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.30 : 922.36 = 402.86 : x
  2. Step 2: Convert to fraction form
    668.30/922.36 = 402.86/x
  3. Step 3: Cross multiply
    668.30x = 922.36 × 402.86
  4. Step 4: Simplify right side
    668.30x = 371,581.95
  5. Step 5: Solve for x
    x = 371,581.95/668.30
  6. Step 6: Final answer
    x = 556.01

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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.