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Finding the Fourth Proportional to 430.02, 643.82 and 299.88

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Solution

The fourth proportional to 430.02, 643.82 and 299.88 is: 448.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.02 : 643.82 = 299.88 : x
  2. Step 2: Convert to fraction form
    430.02/643.82 = 299.88/x
  3. Step 3: Cross multiply
    430.02x = 643.82 × 299.88
  4. Step 4: Simplify right side
    430.02x = 193,067.24
  5. Step 5: Solve for x
    x = 193,067.24/430.02
  6. Step 6: Final answer
    x = 448.97

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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.