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Finding the Fourth Proportional to 664.74, 917.40 and 402.90

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Solution

The fourth proportional to 664.74, 917.40 and 402.90 is: 556.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.74 : 917.40 = 402.90 : x
  2. Step 2: Convert to fraction form
    664.74/917.40 = 402.90/x
  3. Step 3: Cross multiply
    664.74x = 917.40 × 402.90
  4. Step 4: Simplify right side
    664.74x = 369,620.46
  5. Step 5: Solve for x
    x = 369,620.46/664.74
  6. Step 6: Final answer
    x = 556.04

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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.