Home / 1,087.61-1,631.55-438.29

Finding the Fourth Proportional to 1,087.61, 1,631.55 and 438.29

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Solution

The fourth proportional to 1,087.61, 1,631.55 and 438.29 is: 657.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.61 : 1,631.55 = 438.29 : x
  2. Step 2: Convert to fraction form
    1,087.61/1,631.55 = 438.29/x
  3. Step 3: Cross multiply
    1,087.61x = 1,631.55 × 438.29
  4. Step 4: Simplify right side
    1,087.61x = 715,083.89
  5. Step 5: Solve for x
    x = 715,083.89/1,087.61
  6. Step 6: Final answer
    x = 657.48

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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.