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Finding the Fourth Proportional to 430.55, 645.23 and 198.86

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Solution

The fourth proportional to 430.55, 645.23 and 198.86 is: 298.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.55 : 645.23 = 198.86 : x
  2. Step 2: Convert to fraction form
    430.55/645.23 = 198.86/x
  3. Step 3: Cross multiply
    430.55x = 645.23 × 198.86
  4. Step 4: Simplify right side
    430.55x = 128,306.22
  5. Step 5: Solve for x
    x = 128,306.22/430.55
  6. Step 6: Final answer
    x = 298.01

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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.