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Finding the Fourth Proportional to 665.13, 917.90 and 403.23

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Solution

The fourth proportional to 665.13, 917.90 and 403.23 is: 556.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.13 : 917.90 = 403.23 : x
  2. Step 2: Convert to fraction form
    665.13/917.90 = 403.23/x
  3. Step 3: Cross multiply
    665.13x = 917.90 × 403.23
  4. Step 4: Simplify right side
    665.13x = 370,122.80
  5. Step 5: Solve for x
    x = 370,122.80/665.13
  6. Step 6: Final answer
    x = 556.47

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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.