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Finding the Fourth Proportional to 538.70, 806.70 and 430.70

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Solution

The fourth proportional to 538.70, 806.70 and 430.70 is: 644.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.70 : 806.70 = 430.70 : x
  2. Step 2: Convert to fraction form
    538.70/806.70 = 430.70/x
  3. Step 3: Cross multiply
    538.70x = 806.70 × 430.70
  4. Step 4: Simplify right side
    538.70x = 347,445.69
  5. Step 5: Solve for x
    x = 347,445.69/538.70
  6. Step 6: Final answer
    x = 644.97

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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.