Home / 1,087.80-1,631.34-318.12

Finding the Fourth Proportional to 1,087.80, 1,631.34 and 318.12

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Solution

The fourth proportional to 1,087.80, 1,631.34 and 318.12 is: 477.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.80 : 1,631.34 = 318.12 : x
  2. Step 2: Convert to fraction form
    1,087.80/1,631.34 = 318.12/x
  3. Step 3: Cross multiply
    1,087.80x = 1,631.34 × 318.12
  4. Step 4: Simplify right side
    1,087.80x = 518,961.88
  5. Step 5: Solve for x
    x = 518,961.88/1,087.80
  6. Step 6: Final answer
    x = 477.07

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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.