Home / 85,895.40-128,648.70-54,402.60

Finding the Fourth Proportional to 85,895.40, 128,648.70 and 54,402.60

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Solution

The fourth proportional to 85,895.40, 128,648.70 and 54,402.60 is: 81,480.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,895.40 : 128,648.70 = 54,402.60 : x
  2. Step 2: Convert to fraction form
    85,895.40/128,648.70 = 54,402.60/x
  3. Step 3: Cross multiply
    85,895.40x = 128,648.70 × 54,402.60
  4. Step 4: Simplify right side
    85,895.40x = 6,998,823,766.62
  5. Step 5: Solve for x
    x = 6,998,823,766.62/85,895.40
  6. Step 6: Final answer
    x = 81,480.78

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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.