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Finding the Fourth Proportional to 1,812.87, 2,719.73 and 642.81

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Solution

The fourth proportional to 1,812.87, 2,719.73 and 642.81 is: 964.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,812.87 : 2,719.73 = 642.81 : x
  2. Step 2: Convert to fraction form
    1,812.87/2,719.73 = 642.81/x
  3. Step 3: Cross multiply
    1,812.87x = 2,719.73 × 642.81
  4. Step 4: Simplify right side
    1,812.87x = 1,748,266.43
  5. Step 5: Solve for x
    x = 1,748,266.43/1,812.87
  6. Step 6: Final answer
    x = 964.36

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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.