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Finding the Fourth Proportional to 1,246.81, 1,870.50 and 381.19

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Solution

The fourth proportional to 1,246.81, 1,870.50 and 381.19 is: 571.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.81 : 1,870.50 = 381.19 : x
  2. Step 2: Convert to fraction form
    1,246.81/1,870.50 = 381.19/x
  3. Step 3: Cross multiply
    1,246.81x = 1,870.50 × 381.19
  4. Step 4: Simplify right side
    1,246.81x = 713,015.90
  5. Step 5: Solve for x
    x = 713,015.90/1,246.81
  6. Step 6: Final answer
    x = 571.87

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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.