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Finding the Fourth Proportional to 430.25, 644.53 and 198.82

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Solution

The fourth proportional to 430.25, 644.53 and 198.82 is: 297.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.25 : 644.53 = 198.82 : x
  2. Step 2: Convert to fraction form
    430.25/644.53 = 198.82/x
  3. Step 3: Cross multiply
    430.25x = 644.53 × 198.82
  4. Step 4: Simplify right side
    430.25x = 128,146.07
  5. Step 5: Solve for x
    x = 128,146.07/430.25
  6. Step 6: Final answer
    x = 297.84

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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.