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Finding the Fourth Proportional to 665.63, 1,003.43 and 621.03

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Solution

The fourth proportional to 665.63, 1,003.43 and 621.03 is: 936.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.63 : 1,003.43 = 621.03 : x
  2. Step 2: Convert to fraction form
    665.63/1,003.43 = 621.03/x
  3. Step 3: Cross multiply
    665.63x = 1,003.43 × 621.03
  4. Step 4: Simplify right side
    665.63x = 623,160.13
  5. Step 5: Solve for x
    x = 623,160.13/665.63
  6. Step 6: Final answer
    x = 936.20

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.