Home / 20,965.43-31,448.05-7,638.50

Finding the Fourth Proportional to 20,965.43, 31,448.05 and 7,638.50

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Solution

The fourth proportional to 20,965.43, 31,448.05 and 7,638.50 is: 11,457.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,965.43 : 31,448.05 = 7,638.50 : x
  2. Step 2: Convert to fraction form
    20,965.43/31,448.05 = 7,638.50/x
  3. Step 3: Cross multiply
    20,965.43x = 31,448.05 × 7,638.50
  4. Step 4: Simplify right side
    20,965.43x = 240,215,989.45
  5. Step 5: Solve for x
    x = 240,215,989.45/20,965.43
  6. Step 6: Final answer
    x = 11,457.72

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1.5x scale

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.