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Finding the Fourth Proportional to 628.76, 943.74 and 385.76

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Solution

The fourth proportional to 628.76, 943.74 and 385.76 is: 579.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.76 : 943.74 = 385.76 : x
  2. Step 2: Convert to fraction form
    628.76/943.74 = 385.76/x
  3. Step 3: Cross multiply
    628.76x = 943.74 × 385.76
  4. Step 4: Simplify right side
    628.76x = 364,053.82
  5. Step 5: Solve for x
    x = 364,053.82/628.76
  6. Step 6: Final answer
    x = 579.01

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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.