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Finding the Fourth Proportional to 665.95, 998.10 and 421.93

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Solution

The fourth proportional to 665.95, 998.10 and 421.93 is: 632.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.95 : 998.10 = 421.93 : x
  2. Step 2: Convert to fraction form
    665.95/998.10 = 421.93/x
  3. Step 3: Cross multiply
    665.95x = 998.10 × 421.93
  4. Step 4: Simplify right side
    665.95x = 421,128.33
  5. Step 5: Solve for x
    x = 421,128.33/665.95
  6. Step 6: Final answer
    x = 632.37

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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.