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Finding the Fourth Proportional to 1,282.85, 1,925.40 and 762.20

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Solution

The fourth proportional to 1,282.85, 1,925.40 and 762.20 is: 1,143.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.85 : 1,925.40 = 762.20 : x
  2. Step 2: Convert to fraction form
    1,282.85/1,925.40 = 762.20/x
  3. Step 3: Cross multiply
    1,282.85x = 1,925.40 × 762.20
  4. Step 4: Simplify right side
    1,282.85x = 1,467,539.88
  5. Step 5: Solve for x
    x = 1,467,539.88/1,282.85
  6. Step 6: Final answer
    x = 1,143.97

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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.