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Finding the Fourth Proportional to 1,321.21, 1,823.31 and 761.86

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Solution

The fourth proportional to 1,321.21, 1,823.31 and 761.86 is: 1,051.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.21 : 1,823.31 = 761.86 : x
  2. Step 2: Convert to fraction form
    1,321.21/1,823.31 = 761.86/x
  3. Step 3: Cross multiply
    1,321.21x = 1,823.31 × 761.86
  4. Step 4: Simplify right side
    1,321.21x = 1,389,098.98
  5. Step 5: Solve for x
    x = 1,389,098.98/1,321.21
  6. Step 6: Final answer
    x = 1,051.38

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1.5x scale

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.