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Finding the Fourth Proportional to 54,659.40, 81,989.10 and 28,415.40

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Solution

The fourth proportional to 54,659.40, 81,989.10 and 28,415.40 is: 42,623.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,659.40 : 81,989.10 = 28,415.40 : x
  2. Step 2: Convert to fraction form
    54,659.40/81,989.10 = 28,415.40/x
  3. Step 3: Cross multiply
    54,659.40x = 81,989.10 × 28,415.40
  4. Step 4: Simplify right side
    54,659.40x = 2,329,753,072.14
  5. Step 5: Solve for x
    x = 2,329,753,072.14/54,659.40
  6. Step 6: Final answer
    x = 42,623.10

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Similar ratio
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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.