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Finding the Fourth Proportional to 538.42, 806.79 and 430.18

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Solution

The fourth proportional to 538.42, 806.79 and 430.18 is: 644.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.42 : 806.79 = 430.18 : x
  2. Step 2: Convert to fraction form
    538.42/806.79 = 430.18/x
  3. Step 3: Cross multiply
    538.42x = 806.79 × 430.18
  4. Step 4: Simplify right side
    538.42x = 347,064.92
  5. Step 5: Solve for x
    x = 347,064.92/538.42
  6. Step 6: Final answer
    x = 644.60

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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.