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Finding the Fourth Proportional to 668.35, 921.67 and 520.93

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Solution

The fourth proportional to 668.35, 921.67 and 520.93 is: 718.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.35 : 921.67 = 520.93 : x
  2. Step 2: Convert to fraction form
    668.35/921.67 = 520.93/x
  3. Step 3: Cross multiply
    668.35x = 921.67 × 520.93
  4. Step 4: Simplify right side
    668.35x = 480,125.55
  5. Step 5: Solve for x
    x = 480,125.55/668.35
  6. Step 6: Final answer
    x = 718.37

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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.