Home / 1,087.50-1,631.31-318.06

Finding the Fourth Proportional to 1,087.50, 1,631.31 and 318.06

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Solution

The fourth proportional to 1,087.50, 1,631.31 and 318.06 is: 477.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.50 : 1,631.31 = 318.06 : x
  2. Step 2: Convert to fraction form
    1,087.50/1,631.31 = 318.06/x
  3. Step 3: Cross multiply
    1,087.50x = 1,631.31 × 318.06
  4. Step 4: Simplify right side
    1,087.50x = 518,854.46
  5. Step 5: Solve for x
    x = 518,854.46/1,087.50
  6. Step 6: Final answer
    x = 477.11

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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.