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Finding the Fourth Proportional to 54,000.20, 81,000.30 and 39,139.40

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Solution

The fourth proportional to 54,000.20, 81,000.30 and 39,139.40 is: 58,709.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,000.20 : 81,000.30 = 39,139.40 : x
  2. Step 2: Convert to fraction form
    54,000.20/81,000.30 = 39,139.40/x
  3. Step 3: Cross multiply
    54,000.20x = 81,000.30 × 39,139.40
  4. Step 4: Simplify right side
    54,000.20x = 3,170,303,141.82
  5. Step 5: Solve for x
    x = 3,170,303,141.82/54,000.20
  6. Step 6: Final answer
    x = 58,709.10

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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.