Home / 1,087.38-1,631.36-317.88

Finding the Fourth Proportional to 1,087.38, 1,631.36 and 317.88

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Solution

The fourth proportional to 1,087.38, 1,631.36 and 317.88 is: 476.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.38 : 1,631.36 = 317.88 : x
  2. Step 2: Convert to fraction form
    1,087.38/1,631.36 = 317.88/x
  3. Step 3: Cross multiply
    1,087.38x = 1,631.36 × 317.88
  4. Step 4: Simplify right side
    1,087.38x = 518,576.72
  5. Step 5: Solve for x
    x = 518,576.72/1,087.38
  6. Step 6: Final answer
    x = 476.90

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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.