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Finding the Fourth Proportional to 85,455.76, 128,187.90 and 35,530.60

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Solution

The fourth proportional to 85,455.76, 128,187.90 and 35,530.60 is: 53,297.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,455.76 : 128,187.90 = 35,530.60 : x
  2. Step 2: Convert to fraction form
    85,455.76/128,187.90 = 35,530.60/x
  3. Step 3: Cross multiply
    85,455.76x = 128,187.90 × 35,530.60
  4. Step 4: Simplify right side
    85,455.76x = 4,554,592,999.74
  5. Step 5: Solve for x
    x = 4,554,592,999.74/85,455.76
  6. Step 6: Final answer
    x = 53,297.67

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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.