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Finding the Fourth Proportional to 628.73, 939.79 and 545.81

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Solution

The fourth proportional to 628.73, 939.79 and 545.81 is: 815.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.73 : 939.79 = 545.81 : x
  2. Step 2: Convert to fraction form
    628.73/939.79 = 545.81/x
  3. Step 3: Cross multiply
    628.73x = 939.79 × 545.81
  4. Step 4: Simplify right side
    628.73x = 512,942.76
  5. Step 5: Solve for x
    x = 512,942.76/628.73
  6. Step 6: Final answer
    x = 815.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.