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Finding the Fourth Proportional to 1,321.47, 1,823.63 and 761.97

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Solution

The fourth proportional to 1,321.47, 1,823.63 and 761.97 is: 1,051.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.47 : 1,823.63 = 761.97 : x
  2. Step 2: Convert to fraction form
    1,321.47/1,823.63 = 761.97/x
  3. Step 3: Cross multiply
    1,321.47x = 1,823.63 × 761.97
  4. Step 4: Simplify right side
    1,321.47x = 1,389,556.52
  5. Step 5: Solve for x
    x = 1,389,556.52/1,321.47
  6. Step 6: Final answer
    x = 1,051.53

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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.