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Finding the Fourth Proportional to 85,459.05, 128,149.61 and 35,509.32

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Solution

The fourth proportional to 85,459.05, 128,149.61 and 35,509.32 is: 53,247.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,459.05 : 128,149.61 = 35,509.32 : x
  2. Step 2: Convert to fraction form
    85,459.05/128,149.61 = 35,509.32/x
  3. Step 3: Cross multiply
    85,459.05x = 128,149.61 × 35,509.32
  4. Step 4: Simplify right side
    85,459.05x = 4,550,505,331.82
  5. Step 5: Solve for x
    x = 4,550,505,331.82/85,459.05
  6. Step 6: Final answer
    x = 53,247.79

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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.