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Finding the Fourth Proportional to 628.02, 942.30 and 518.40

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Solution

The fourth proportional to 628.02, 942.30 and 518.40 is: 777.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.02 : 942.30 = 518.40 : x
  2. Step 2: Convert to fraction form
    628.02/942.30 = 518.40/x
  3. Step 3: Cross multiply
    628.02x = 942.30 × 518.40
  4. Step 4: Simplify right side
    628.02x = 488,488.32
  5. Step 5: Solve for x
    x = 488,488.32/628.02
  6. Step 6: Final answer
    x = 777.82

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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.