Home / 1,087.50-1,631.25-403.50

Finding the Fourth Proportional to 1,087.50, 1,631.25 and 403.50

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Solution

The fourth proportional to 1,087.50, 1,631.25 and 403.50 is: 605.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.50 : 1,631.25 = 403.50 : x
  2. Step 2: Convert to fraction form
    1,087.50/1,631.25 = 403.50/x
  3. Step 3: Cross multiply
    1,087.50x = 1,631.25 × 403.50
  4. Step 4: Simplify right side
    1,087.50x = 658,209.38
  5. Step 5: Solve for x
    x = 658,209.38/1,087.50
  6. Step 6: Final answer
    x = 605.25

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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.