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Finding the Fourth Proportional to 668.42, 921.53 and 468.99

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Solution

The fourth proportional to 668.42, 921.53 and 468.99 is: 646.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.42 : 921.53 = 468.99 : x
  2. Step 2: Convert to fraction form
    668.42/921.53 = 468.99/x
  3. Step 3: Cross multiply
    668.42x = 921.53 × 468.99
  4. Step 4: Simplify right side
    668.42x = 432,186.89
  5. Step 5: Solve for x
    x = 432,186.89/668.42
  6. Step 6: Final answer
    x = 646.58

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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.