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Finding the Fourth Proportional to 1,412.94, 2,120.04 and 762.92

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Solution

The fourth proportional to 1,412.94, 2,120.04 and 762.92 is: 1,144.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,412.94 : 2,120.04 = 762.92 : x
  2. Step 2: Convert to fraction form
    1,412.94/2,120.04 = 762.92/x
  3. Step 3: Cross multiply
    1,412.94x = 2,120.04 × 762.92
  4. Step 4: Simplify right side
    1,412.94x = 1,617,420.92
  5. Step 5: Solve for x
    x = 1,617,420.92/1,412.94
  6. Step 6: Final answer
    x = 1,144.72

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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.