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Finding the Fourth Proportional to 1,205.67, 1,808.29 and 339.78

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Solution

The fourth proportional to 1,205.67, 1,808.29 and 339.78 is: 509.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.67 : 1,808.29 = 339.78 : x
  2. Step 2: Convert to fraction form
    1,205.67/1,808.29 = 339.78/x
  3. Step 3: Cross multiply
    1,205.67x = 1,808.29 × 339.78
  4. Step 4: Simplify right side
    1,205.67x = 614,412.58
  5. Step 5: Solve for x
    x = 614,412.58/1,205.67
  6. Step 6: Final answer
    x = 509.60

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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.