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Finding the Fourth Proportional to 664.63, 917.28 and 402.73

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Solution

The fourth proportional to 664.63, 917.28 and 402.73 is: 555.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.63 : 917.28 = 402.73 : x
  2. Step 2: Convert to fraction form
    664.63/917.28 = 402.73/x
  3. Step 3: Cross multiply
    664.63x = 917.28 × 402.73
  4. Step 4: Simplify right side
    664.63x = 369,416.17
  5. Step 5: Solve for x
    x = 369,416.17/664.63
  6. Step 6: Final answer
    x = 555.82

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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.