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Finding the Fourth Proportional to 668.63, 922.71 and 392.63

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Solution

The fourth proportional to 668.63, 922.71 and 392.63 is: 541.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.63 : 922.71 = 392.63 : x
  2. Step 2: Convert to fraction form
    668.63/922.71 = 392.63/x
  3. Step 3: Cross multiply
    668.63x = 922.71 × 392.63
  4. Step 4: Simplify right side
    668.63x = 362,279.01
  5. Step 5: Solve for x
    x = 362,279.01/668.63
  6. Step 6: Final answer
    x = 541.83

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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.