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Finding the Fourth Proportional to 628.85, 940.43 and 543.20

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Solution

The fourth proportional to 628.85, 940.43 and 543.20 is: 812.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.85 : 940.43 = 543.20 : x
  2. Step 2: Convert to fraction form
    628.85/940.43 = 543.20/x
  3. Step 3: Cross multiply
    628.85x = 940.43 × 543.20
  4. Step 4: Simplify right side
    628.85x = 510,834.16
  5. Step 5: Solve for x
    x = 510,834.16/628.85
  6. Step 6: Final answer
    x = 812.34

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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.