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Finding the Fourth Proportional to 423.07, 583.78 and 257.30

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Solution

The fourth proportional to 423.07, 583.78 and 257.30 is: 355.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.07 : 583.78 = 257.30 : x
  2. Step 2: Convert to fraction form
    423.07/583.78 = 257.30/x
  3. Step 3: Cross multiply
    423.07x = 583.78 × 257.30
  4. Step 4: Simplify right side
    423.07x = 150,206.59
  5. Step 5: Solve for x
    x = 150,206.59/423.07
  6. Step 6: Final answer
    x = 355.04

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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.