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Finding the Fourth Proportional to 54,259.80, 81,486.90 and 39,485.40

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Solution

The fourth proportional to 54,259.80, 81,486.90 and 39,485.40 is: 59,298.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,259.80 : 81,486.90 = 39,485.40 : x
  2. Step 2: Convert to fraction form
    54,259.80/81,486.90 = 39,485.40/x
  3. Step 3: Cross multiply
    54,259.80x = 81,486.90 × 39,485.40
  4. Step 4: Simplify right side
    54,259.80x = 3,217,542,841.26
  5. Step 5: Solve for x
    x = 3,217,542,841.26/54,259.80
  6. Step 6: Final answer
    x = 59,298.83

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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.