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Finding the Fourth Proportional to 1,391.58, 2,087.20 and 365.66

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Solution

The fourth proportional to 1,391.58, 2,087.20 and 365.66 is: 548.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.58 : 2,087.20 = 365.66 : x
  2. Step 2: Convert to fraction form
    1,391.58/2,087.20 = 365.66/x
  3. Step 3: Cross multiply
    1,391.58x = 2,087.20 × 365.66
  4. Step 4: Simplify right side
    1,391.58x = 763,205.55
  5. Step 5: Solve for x
    x = 763,205.55/1,391.58
  6. Step 6: Final answer
    x = 548.45

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.