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Finding the Fourth Proportional to 430.56, 644.63 and 347.81

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Solution

The fourth proportional to 430.56, 644.63 and 347.81 is: 520.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.56 : 644.63 = 347.81 : x
  2. Step 2: Convert to fraction form
    430.56/644.63 = 347.81/x
  3. Step 3: Cross multiply
    430.56x = 644.63 × 347.81
  4. Step 4: Simplify right side
    430.56x = 224,203.80
  5. Step 5: Solve for x
    x = 224,203.80/430.56
  6. Step 6: Final answer
    x = 520.73

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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.