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Finding the Fourth Proportional to 430.32, 644.92 and 199.32

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Solution

The fourth proportional to 430.32, 644.92 and 199.32 is: 298.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.32 : 644.92 = 199.32 : x
  2. Step 2: Convert to fraction form
    430.32/644.92 = 199.32/x
  3. Step 3: Cross multiply
    430.32x = 644.92 × 199.32
  4. Step 4: Simplify right side
    430.32x = 128,545.45
  5. Step 5: Solve for x
    x = 128,545.45/430.32
  6. Step 6: Final answer
    x = 298.72

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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.