Home / 5,087.90-7,631.78-1,390.05

Finding the Fourth Proportional to 5,087.90, 7,631.78 and 1,390.05

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Solution

The fourth proportional to 5,087.90, 7,631.78 and 1,390.05 is: 2,085.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,087.90 : 7,631.78 = 1,390.05 : x
  2. Step 2: Convert to fraction form
    5,087.90/7,631.78 = 1,390.05/x
  3. Step 3: Cross multiply
    5,087.90x = 7,631.78 × 1,390.05
  4. Step 4: Simplify right side
    5,087.90x = 10,608,548.84
  5. Step 5: Solve for x
    x = 10,608,548.84/5,087.90
  6. Step 6: Final answer
    x = 2,085.06

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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.