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Finding the Fourth Proportional to 1,239.96, 1,860.39 and 509.61

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Solution

The fourth proportional to 1,239.96, 1,860.39 and 509.61 is: 764.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.96 : 1,860.39 = 509.61 : x
  2. Step 2: Convert to fraction form
    1,239.96/1,860.39 = 509.61/x
  3. Step 3: Cross multiply
    1,239.96x = 1,860.39 × 509.61
  4. Step 4: Simplify right side
    1,239.96x = 948,073.35
  5. Step 5: Solve for x
    x = 948,073.35/1,239.96
  6. Step 6: Final answer
    x = 764.60

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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.