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Finding the Fourth Proportional to 755.02, 1,039.62 and 661.24

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Solution

The fourth proportional to 755.02, 1,039.62 and 661.24 is: 910.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.02 : 1,039.62 = 661.24 : x
  2. Step 2: Convert to fraction form
    755.02/1,039.62 = 661.24/x
  3. Step 3: Cross multiply
    755.02x = 1,039.62 × 661.24
  4. Step 4: Simplify right side
    755.02x = 687,438.33
  5. Step 5: Solve for x
    x = 687,438.33/755.02
  6. Step 6: Final answer
    x = 910.49

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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.