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Finding the Fourth Proportional to 45,218.40, 67,780.80 and 20,270.40

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Solution

The fourth proportional to 45,218.40, 67,780.80 and 20,270.40 is: 30,384.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,218.40 : 67,780.80 = 20,270.40 : x
  2. Step 2: Convert to fraction form
    45,218.40/67,780.80 = 20,270.40/x
  3. Step 3: Cross multiply
    45,218.40x = 67,780.80 × 20,270.40
  4. Step 4: Simplify right side
    45,218.40x = 1,373,943,928.32
  5. Step 5: Solve for x
    x = 1,373,943,928.32/45,218.40
  6. Step 6: Final answer
    x = 30,384.62

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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.