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Finding the Fourth Proportional to 1,263.89, 1,743.99 and 766.45

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Solution

The fourth proportional to 1,263.89, 1,743.99 and 766.45 is: 1,057.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,263.89 : 1,743.99 = 766.45 : x
  2. Step 2: Convert to fraction form
    1,263.89/1,743.99 = 766.45/x
  3. Step 3: Cross multiply
    1,263.89x = 1,743.99 × 766.45
  4. Step 4: Simplify right side
    1,263.89x = 1,336,681.14
  5. Step 5: Solve for x
    x = 1,336,681.14/1,263.89
  6. Step 6: Final answer
    x = 1,057.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.