Home / 54,278.20-81,378.90-20,985.40

Finding the Fourth Proportional to 54,278.20, 81,378.90 and 20,985.40

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Solution

The fourth proportional to 54,278.20, 81,378.90 and 20,985.40 is: 31,463.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,278.20 : 81,378.90 = 20,985.40 : x
  2. Step 2: Convert to fraction form
    54,278.20/81,378.90 = 20,985.40/x
  3. Step 3: Cross multiply
    54,278.20x = 81,378.90 × 20,985.40
  4. Step 4: Simplify right side
    54,278.20x = 1,707,768,768.06
  5. Step 5: Solve for x
    x = 1,707,768,768.06/54,278.20
  6. Step 6: Final answer
    x = 31,463.25

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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.