Home / 1,087.92-1,631.70-438.66

Finding the Fourth Proportional to 1,087.92, 1,631.70 and 438.66

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Solution

The fourth proportional to 1,087.92, 1,631.70 and 438.66 is: 657.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.92 : 1,631.70 = 438.66 : x
  2. Step 2: Convert to fraction form
    1,087.92/1,631.70 = 438.66/x
  3. Step 3: Cross multiply
    1,087.92x = 1,631.70 × 438.66
  4. Step 4: Simplify right side
    1,087.92x = 715,761.52
  5. Step 5: Solve for x
    x = 715,761.52/1,087.92
  6. Step 6: Final answer
    x = 657.92

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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.