Home / 1,087.36-1,631.12-438.24

Finding the Fourth Proportional to 1,087.36, 1,631.12 and 438.24

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Solution

The fourth proportional to 1,087.36, 1,631.12 and 438.24 is: 657.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.36 : 1,631.12 = 438.24 : x
  2. Step 2: Convert to fraction form
    1,087.36/1,631.12 = 438.24/x
  3. Step 3: Cross multiply
    1,087.36x = 1,631.12 × 438.24
  4. Step 4: Simplify right side
    1,087.36x = 714,822.03
  5. Step 5: Solve for x
    x = 714,822.03/1,087.36
  6. Step 6: Final answer
    x = 657.39

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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.