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Finding the Fourth Proportional to 1,187.88, 1,782.36 and 495

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Solution

The fourth proportional to 1,187.88, 1,782.36 and 495 is: 742.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.88 : 1,782.36 = 495 : x
  2. Step 2: Convert to fraction form
    1,187.88/1,782.36 = 495/x
  3. Step 3: Cross multiply
    1,187.88x = 1,782.36 × 495
  4. Step 4: Simplify right side
    1,187.88x = 882,268.20
  5. Step 5: Solve for x
    x = 882,268.20/1,187.88
  6. Step 6: Final answer
    x = 742.73

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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.