Home / 85,621.80-128,430.30-38,874.60

Finding the Fourth Proportional to 85,621.80, 128,430.30 and 38,874.60

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Solution

The fourth proportional to 85,621.80, 128,430.30 and 38,874.60 is: 58,310.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,621.80 : 128,430.30 = 38,874.60 : x
  2. Step 2: Convert to fraction form
    85,621.80/128,430.30 = 38,874.60/x
  3. Step 3: Cross multiply
    85,621.80x = 128,430.30 × 38,874.60
  4. Step 4: Simplify right side
    85,621.80x = 4,992,676,540.38
  5. Step 5: Solve for x
    x = 4,992,676,540.38/85,621.80
  6. Step 6: Final answer
    x = 58,310.81

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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.