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Finding the Fourth Proportional to 425.99, 639 and 165.93

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Solution

The fourth proportional to 425.99, 639 and 165.93 is: 248.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.99 : 639 = 165.93 : x
  2. Step 2: Convert to fraction form
    425.99/639 = 165.93/x
  3. Step 3: Cross multiply
    425.99x = 639 × 165.93
  4. Step 4: Simplify right side
    425.99x = 106,030.47
  5. Step 5: Solve for x
    x = 106,030.47/425.99
  6. Step 6: Final answer
    x = 248.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.