Home / 30,898.20-42,674.55-20,809.11

Finding the Fourth Proportional to 30,898.20, 42,674.55 and 20,809.11

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Solution

The fourth proportional to 30,898.20, 42,674.55 and 20,809.11 is: 28,740.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,898.20 : 42,674.55 = 20,809.11 : x
  2. Step 2: Convert to fraction form
    30,898.20/42,674.55 = 20,809.11/x
  3. Step 3: Cross multiply
    30,898.20x = 42,674.55 × 20,809.11
  4. Step 4: Simplify right side
    30,898.20x = 888,019,405.15
  5. Step 5: Solve for x
    x = 888,019,405.15/30,898.20
  6. Step 6: Final answer
    x = 28,740.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.