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Finding the Fourth Proportional to 1,812.78, 2,719.38 and 658.80

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Solution

The fourth proportional to 1,812.78, 2,719.38 and 658.80 is: 988.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,812.78 : 2,719.38 = 658.80 : x
  2. Step 2: Convert to fraction form
    1,812.78/2,719.38 = 658.80/x
  3. Step 3: Cross multiply
    1,812.78x = 2,719.38 × 658.80
  4. Step 4: Simplify right side
    1,812.78x = 1,791,527.54
  5. Step 5: Solve for x
    x = 1,791,527.54/1,812.78
  6. Step 6: Final answer
    x = 988.28

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1.5x scale

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.