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Finding the Fourth Proportional to 664.69, 916.84 and 428.93

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Solution

The fourth proportional to 664.69, 916.84 and 428.93 is: 591.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.69 : 916.84 = 428.93 : x
  2. Step 2: Convert to fraction form
    664.69/916.84 = 428.93/x
  3. Step 3: Cross multiply
    664.69x = 916.84 × 428.93
  4. Step 4: Simplify right side
    664.69x = 393,260.18
  5. Step 5: Solve for x
    x = 393,260.18/664.69
  6. Step 6: Final answer
    x = 591.64

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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.