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Finding the Fourth Proportional to 85,431.25, 128,098.87 and 35,477.74

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Solution

The fourth proportional to 85,431.25, 128,098.87 and 35,477.74 is: 53,196.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,431.25 : 128,098.87 = 35,477.74 : x
  2. Step 2: Convert to fraction form
    85,431.25/128,098.87 = 35,477.74/x
  3. Step 3: Cross multiply
    85,431.25x = 128,098.87 × 35,477.74
  4. Step 4: Simplify right side
    85,431.25x = 4,544,657,674.97
  5. Step 5: Solve for x
    x = 4,544,657,674.97/85,431.25
  6. Step 6: Final answer
    x = 53,196.67

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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.