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Finding the Fourth Proportional to 629.16, 867.90 and 393.04

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Solution

The fourth proportional to 629.16, 867.90 and 393.04 is: 542.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.16 : 867.90 = 393.04 : x
  2. Step 2: Convert to fraction form
    629.16/867.90 = 393.04/x
  3. Step 3: Cross multiply
    629.16x = 867.90 × 393.04
  4. Step 4: Simplify right side
    629.16x = 341,119.42
  5. Step 5: Solve for x
    x = 341,119.42/629.16
  6. Step 6: Final answer
    x = 542.18

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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.