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Finding the Fourth Proportional to 665.48, 917.97 and 403.46

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Solution

The fourth proportional to 665.48, 917.97 and 403.46 is: 556.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.48 : 917.97 = 403.46 : x
  2. Step 2: Convert to fraction form
    665.48/917.97 = 403.46/x
  3. Step 3: Cross multiply
    665.48x = 917.97 × 403.46
  4. Step 4: Simplify right side
    665.48x = 370,364.18
  5. Step 5: Solve for x
    x = 370,364.18/665.48
  6. Step 6: Final answer
    x = 556.54

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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.