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Finding the Fourth Proportional to 999.01, 1,498.24 and 421.75

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Solution

The fourth proportional to 999.01, 1,498.24 and 421.75 is: 632.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.01 : 1,498.24 = 421.75 : x
  2. Step 2: Convert to fraction form
    999.01/1,498.24 = 421.75/x
  3. Step 3: Cross multiply
    999.01x = 1,498.24 × 421.75
  4. Step 4: Simplify right side
    999.01x = 631,882.72
  5. Step 5: Solve for x
    x = 631,882.72/999.01
  6. Step 6: Final answer
    x = 632.51

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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.