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Finding the Fourth Proportional to 425.40, 586.39 and 355.69

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Solution

The fourth proportional to 425.40, 586.39 and 355.69 is: 490.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.40 : 586.39 = 355.69 : x
  2. Step 2: Convert to fraction form
    425.40/586.39 = 355.69/x
  3. Step 3: Cross multiply
    425.40x = 586.39 × 355.69
  4. Step 4: Simplify right side
    425.40x = 208,573.57
  5. Step 5: Solve for x
    x = 208,573.57/425.40
  6. Step 6: Final answer
    x = 490.30

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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.