Home / 20,178.72-30,287.52-18,905.40

Finding the Fourth Proportional to 20,178.72, 30,287.52 and 18,905.40

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Solution

The fourth proportional to 20,178.72, 30,287.52 and 18,905.40 is: 28,376.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,178.72 : 30,287.52 = 18,905.40 : x
  2. Step 2: Convert to fraction form
    20,178.72/30,287.52 = 18,905.40/x
  3. Step 3: Cross multiply
    20,178.72x = 30,287.52 × 18,905.40
  4. Step 4: Simplify right side
    20,178.72x = 572,597,680.61
  5. Step 5: Solve for x
    x = 572,597,680.61/20,178.72
  6. Step 6: Final answer
    x = 28,376.31

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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.