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Finding the Fourth Proportional to 54,511.40, 81,750.90 and 21,212.30

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Solution

The fourth proportional to 54,511.40, 81,750.90 and 21,212.30 is: 31,812.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,511.40 : 81,750.90 = 21,212.30 : x
  2. Step 2: Convert to fraction form
    54,511.40/81,750.90 = 21,212.30/x
  3. Step 3: Cross multiply
    54,511.40x = 81,750.90 × 21,212.30
  4. Step 4: Simplify right side
    54,511.40x = 1,734,124,616.07
  5. Step 5: Solve for x
    x = 1,734,124,616.07/54,511.40
  6. Step 6: Final answer
    x = 31,812.15

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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.