Home / 8,140.72-12,203.88-3,978.40

Finding the Fourth Proportional to 8,140.72, 12,203.88 and 3,978.40

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Solution

The fourth proportional to 8,140.72, 12,203.88 and 3,978.40 is: 5,964.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,140.72 : 12,203.88 = 3,978.40 : x
  2. Step 2: Convert to fraction form
    8,140.72/12,203.88 = 3,978.40/x
  3. Step 3: Cross multiply
    8,140.72x = 12,203.88 × 3,978.40
  4. Step 4: Simplify right side
    8,140.72x = 48,551,916.19
  5. Step 5: Solve for x
    x = 48,551,916.19/8,140.72
  6. Step 6: Final answer
    x = 5,964.08

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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.