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Finding the Fourth Proportional to 54,029.70, 80,989.13 and 20,740.80

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Solution

The fourth proportional to 54,029.70, 80,989.13 and 20,740.80 is: 31,089.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,029.70 : 80,989.13 = 20,740.80 : x
  2. Step 2: Convert to fraction form
    54,029.70/80,989.13 = 20,740.80/x
  3. Step 3: Cross multiply
    54,029.70x = 80,989.13 × 20,740.80
  4. Step 4: Simplify right side
    54,029.70x = 1,679,779,243.80
  5. Step 5: Solve for x
    x = 1,679,779,243.80/54,029.70
  6. Step 6: Final answer
    x = 31,089.92

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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.