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Finding the Fourth Proportional to 423.30, 583.88 and 257.42

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Solution

The fourth proportional to 423.30, 583.88 and 257.42 is: 355.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.30 : 583.88 = 257.42 : x
  2. Step 2: Convert to fraction form
    423.30/583.88 = 257.42/x
  3. Step 3: Cross multiply
    423.30x = 583.88 × 257.42
  4. Step 4: Simplify right side
    423.30x = 150,302.39
  5. Step 5: Solve for x
    x = 150,302.39/423.30
  6. Step 6: Final answer
    x = 355.07

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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.