Home / 20,842.80-31,253.40-7,688.40

Finding the Fourth Proportional to 20,842.80, 31,253.40 and 7,688.40

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Solution

The fourth proportional to 20,842.80, 31,253.40 and 7,688.40 is: 11,528.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,842.80 : 31,253.40 = 7,688.40 : x
  2. Step 2: Convert to fraction form
    20,842.80/31,253.40 = 7,688.40/x
  3. Step 3: Cross multiply
    20,842.80x = 31,253.40 × 7,688.40
  4. Step 4: Simplify right side
    20,842.80x = 240,288,640.56
  5. Step 5: Solve for x
    x = 240,288,640.56/20,842.80
  6. Step 6: Final answer
    x = 11,528.62

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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.