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Finding the Fourth Proportional to 664.53, 916.64 and 428.39

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Solution

The fourth proportional to 664.53, 916.64 and 428.39 is: 590.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.53 : 916.64 = 428.39 : x
  2. Step 2: Convert to fraction form
    664.53/916.64 = 428.39/x
  3. Step 3: Cross multiply
    664.53x = 916.64 × 428.39
  4. Step 4: Simplify right side
    664.53x = 392,678.93
  5. Step 5: Solve for x
    x = 392,678.93/664.53
  6. Step 6: Final answer
    x = 590.91

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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.