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Finding the Fourth Proportional to 85,388.80, 128,083.20 and 54,246.40

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Solution

The fourth proportional to 85,388.80, 128,083.20 and 54,246.40 is: 81,369.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,388.80 : 128,083.20 = 54,246.40 : x
  2. Step 2: Convert to fraction form
    85,388.80/128,083.20 = 54,246.40/x
  3. Step 3: Cross multiply
    85,388.80x = 128,083.20 × 54,246.40
  4. Step 4: Simplify right side
    85,388.80x = 6,948,052,500.48
  5. Step 5: Solve for x
    x = 6,948,052,500.48/85,388.80
  6. Step 6: Final answer
    x = 81,369.60

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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.