Home / 1,087.75-1,631.63-318.25

Finding the Fourth Proportional to 1,087.75, 1,631.63 and 318.25

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Solution

The fourth proportional to 1,087.75, 1,631.63 and 318.25 is: 477.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.75 : 1,631.63 = 318.25 : x
  2. Step 2: Convert to fraction form
    1,087.75/1,631.63 = 318.25/x
  3. Step 3: Cross multiply
    1,087.75x = 1,631.63 × 318.25
  4. Step 4: Simplify right side
    1,087.75x = 519,266.25
  5. Step 5: Solve for x
    x = 519,266.25/1,087.75
  6. Step 6: Final answer
    x = 477.38

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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.