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Finding the Fourth Proportional to 1,256.68, 1,885.62 and 769.45

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Solution

The fourth proportional to 1,256.68, 1,885.62 and 769.45 is: 1,154.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.68 : 1,885.62 = 769.45 : x
  2. Step 2: Convert to fraction form
    1,256.68/1,885.62 = 769.45/x
  3. Step 3: Cross multiply
    1,256.68x = 1,885.62 × 769.45
  4. Step 4: Simplify right side
    1,256.68x = 1,450,890.31
  5. Step 5: Solve for x
    x = 1,450,890.31/1,256.68
  6. Step 6: Final answer
    x = 1,154.54

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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.