Home / 3,989.45-5,985.47-1,909.19

Finding the Fourth Proportional to 3,989.45, 5,985.47 and 1,909.19

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Solution

The fourth proportional to 3,989.45, 5,985.47 and 1,909.19 is: 2,864.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.45 : 5,985.47 = 1,909.19 : x
  2. Step 2: Convert to fraction form
    3,989.45/5,985.47 = 1,909.19/x
  3. Step 3: Cross multiply
    3,989.45x = 5,985.47 × 1,909.19
  4. Step 4: Simplify right side
    3,989.45x = 11,427,360.00
  5. Step 5: Solve for x
    x = 11,427,360.00/3,989.45
  6. Step 6: Final answer
    x = 2,864.40

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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.