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Finding the Fourth Proportional to 1,387.35, 2,080.69 and 509.82

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Solution

The fourth proportional to 1,387.35, 2,080.69 and 509.82 is: 764.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.35 : 2,080.69 = 509.82 : x
  2. Step 2: Convert to fraction form
    1,387.35/2,080.69 = 509.82/x
  3. Step 3: Cross multiply
    1,387.35x = 2,080.69 × 509.82
  4. Step 4: Simplify right side
    1,387.35x = 1,060,777.38
  5. Step 5: Solve for x
    x = 1,060,777.38/1,387.35
  6. Step 6: Final answer
    x = 764.61

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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.