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Finding the Fourth Proportional to 1,327.08, 1,990.70 and 505.29

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Solution

The fourth proportional to 1,327.08, 1,990.70 and 505.29 is: 757.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.08 : 1,990.70 = 505.29 : x
  2. Step 2: Convert to fraction form
    1,327.08/1,990.70 = 505.29/x
  3. Step 3: Cross multiply
    1,327.08x = 1,990.70 × 505.29
  4. Step 4: Simplify right side
    1,327.08x = 1,005,877.86
  5. Step 5: Solve for x
    x = 1,005,877.86/1,327.08
  6. Step 6: Final answer
    x = 757.96

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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.