Home / 8,140.40-12,218.70-3,985.10

Finding the Fourth Proportional to 8,140.40, 12,218.70 and 3,985.10

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Solution

The fourth proportional to 8,140.40, 12,218.70 and 3,985.10 is: 5,981.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,140.40 : 12,218.70 = 3,985.10 : x
  2. Step 2: Convert to fraction form
    8,140.40/12,218.70 = 3,985.10/x
  3. Step 3: Cross multiply
    8,140.40x = 12,218.70 × 3,985.10
  4. Step 4: Simplify right side
    8,140.40x = 48,692,741.37
  5. Step 5: Solve for x
    x = 48,692,741.37/8,140.40
  6. Step 6: Final answer
    x = 5,981.62

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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.