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Finding the Fourth Proportional to 430.44, 645.90 and 345.48

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Solution

The fourth proportional to 430.44, 645.90 and 345.48 is: 518.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.44 : 645.90 = 345.48 : x
  2. Step 2: Convert to fraction form
    430.44/645.90 = 345.48/x
  3. Step 3: Cross multiply
    430.44x = 645.90 × 345.48
  4. Step 4: Simplify right side
    430.44x = 223,145.53
  5. Step 5: Solve for x
    x = 223,145.53/430.44
  6. Step 6: Final answer
    x = 518.41

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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.