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Finding the Fourth Proportional to 849.46, 1,170.90 and 639.32

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Solution

The fourth proportional to 849.46, 1,170.90 and 639.32 is: 881.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.46 : 1,170.90 = 639.32 : x
  2. Step 2: Convert to fraction form
    849.46/1,170.90 = 639.32/x
  3. Step 3: Cross multiply
    849.46x = 1,170.90 × 639.32
  4. Step 4: Simplify right side
    849.46x = 748,579.79
  5. Step 5: Solve for x
    x = 748,579.79/849.46
  6. Step 6: Final answer
    x = 881.24

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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.