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Finding the Fourth Proportional to 425.69, 587.70 and 399.54

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Solution

The fourth proportional to 425.69, 587.70 and 399.54 is: 551.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.69 : 587.70 = 399.54 : x
  2. Step 2: Convert to fraction form
    425.69/587.70 = 399.54/x
  3. Step 3: Cross multiply
    425.69x = 587.70 × 399.54
  4. Step 4: Simplify right side
    425.69x = 234,809.66
  5. Step 5: Solve for x
    x = 234,809.66/425.69
  6. Step 6: Final answer
    x = 551.60

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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.