Home / 10,140.90-15,211.38-3,120.87

Finding the Fourth Proportional to 10,140.90, 15,211.38 and 3,120.87

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Solution

The fourth proportional to 10,140.90, 15,211.38 and 3,120.87 is: 4,681.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,140.90 : 15,211.38 = 3,120.87 : x
  2. Step 2: Convert to fraction form
    10,140.90/15,211.38 = 3,120.87/x
  3. Step 3: Cross multiply
    10,140.90x = 15,211.38 × 3,120.87
  4. Step 4: Simplify right side
    10,140.90x = 47,472,739.50
  5. Step 5: Solve for x
    x = 47,472,739.50/10,140.90
  6. Step 6: Final answer
    x = 4,681.31

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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.