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Finding the Fourth Proportional to 419.28, 625.44 and 389.58

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Solution

The fourth proportional to 419.28, 625.44 and 389.58 is: 581.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.28 : 625.44 = 389.58 : x
  2. Step 2: Convert to fraction form
    419.28/625.44 = 389.58/x
  3. Step 3: Cross multiply
    419.28x = 625.44 × 389.58
  4. Step 4: Simplify right side
    419.28x = 243,658.92
  5. Step 5: Solve for x
    x = 243,658.92/419.28
  6. Step 6: Final answer
    x = 581.14

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.