Home / 1,087.28-1,631.34-509.75

Finding the Fourth Proportional to 1,087.28, 1,631.34 and 509.75

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Solution

The fourth proportional to 1,087.28, 1,631.34 and 509.75 is: 764.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.28 : 1,631.34 = 509.75 : x
  2. Step 2: Convert to fraction form
    1,087.28/1,631.34 = 509.75/x
  3. Step 3: Cross multiply
    1,087.28x = 1,631.34 × 509.75
  4. Step 4: Simplify right side
    1,087.28x = 831,575.57
  5. Step 5: Solve for x
    x = 831,575.57/1,087.28
  6. Step 6: Final answer
    x = 764.82

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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.