Home / 1,087.52-1,631.28-318.08

Finding the Fourth Proportional to 1,087.52, 1,631.28 and 318.08

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Solution

The fourth proportional to 1,087.52, 1,631.28 and 318.08 is: 477.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.52 : 1,631.28 = 318.08 : x
  2. Step 2: Convert to fraction form
    1,087.52/1,631.28 = 318.08/x
  3. Step 3: Cross multiply
    1,087.52x = 1,631.28 × 318.08
  4. Step 4: Simplify right side
    1,087.52x = 518,877.54
  5. Step 5: Solve for x
    x = 518,877.54/1,087.52
  6. Step 6: Final answer
    x = 477.12

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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.