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Finding the Fourth Proportional to 45,728.80, 68,560.80 and 20,780.80

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Solution

The fourth proportional to 45,728.80, 68,560.80 and 20,780.80 is: 31,156.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,728.80 : 68,560.80 = 20,780.80 : x
  2. Step 2: Convert to fraction form
    45,728.80/68,560.80 = 20,780.80/x
  3. Step 3: Cross multiply
    45,728.80x = 68,560.80 × 20,780.80
  4. Step 4: Simplify right side
    45,728.80x = 1,424,748,272.64
  5. Step 5: Solve for x
    x = 1,424,748,272.64/45,728.80
  6. Step 6: Final answer
    x = 31,156.48

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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.