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Finding the Fourth Proportional to 85,430.60, 128,145.90 and 43,958.60

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Solution

The fourth proportional to 85,430.60, 128,145.90 and 43,958.60 is: 65,937.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,430.60 : 128,145.90 = 43,958.60 : x
  2. Step 2: Convert to fraction form
    85,430.60/128,145.90 = 43,958.60/x
  3. Step 3: Cross multiply
    85,430.60x = 128,145.90 × 43,958.60
  4. Step 4: Simplify right side
    85,430.60x = 5,633,114,359.74
  5. Step 5: Solve for x
    x = 5,633,114,359.74/85,430.60
  6. Step 6: Final answer
    x = 65,937.90

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Similar ratio
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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.