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Finding the Fourth Proportional to 1,327.13, 1,990.64 and 546.91

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Solution

The fourth proportional to 1,327.13, 1,990.64 and 546.91 is: 820.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.13 : 1,990.64 = 546.91 : x
  2. Step 2: Convert to fraction form
    1,327.13/1,990.64 = 546.91/x
  3. Step 3: Cross multiply
    1,327.13x = 1,990.64 × 546.91
  4. Step 4: Simplify right side
    1,327.13x = 1,088,700.92
  5. Step 5: Solve for x
    x = 1,088,700.92/1,327.13
  6. Step 6: Final answer
    x = 820.34

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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.