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Finding the Fourth Proportional to 85,376.60, 128,064.90 and 43,904.60

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Solution

The fourth proportional to 85,376.60, 128,064.90 and 43,904.60 is: 65,856.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,376.60 : 128,064.90 = 43,904.60 : x
  2. Step 2: Convert to fraction form
    85,376.60/128,064.90 = 43,904.60/x
  3. Step 3: Cross multiply
    85,376.60x = 128,064.90 × 43,904.60
  4. Step 4: Simplify right side
    85,376.60x = 5,622,638,208.54
  5. Step 5: Solve for x
    x = 5,622,638,208.54/85,376.60
  6. Step 6: Final answer
    x = 65,856.90

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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.