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Finding the Fourth Proportional to 628.60, 943.80 and 491.80

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Solution

The fourth proportional to 628.60, 943.80 and 491.80 is: 738.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.60 : 943.80 = 491.80 : x
  2. Step 2: Convert to fraction form
    628.60/943.80 = 491.80/x
  3. Step 3: Cross multiply
    628.60x = 943.80 × 491.80
  4. Step 4: Simplify right side
    628.60x = 464,160.84
  5. Step 5: Solve for x
    x = 464,160.84/628.60
  6. Step 6: Final answer
    x = 738.40

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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.