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Finding the Fourth Proportional to 85,913.70, 128,761.20 and 76,509.60

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Solution

The fourth proportional to 85,913.70, 128,761.20 and 76,509.60 is: 114,667.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,913.70 : 128,761.20 = 76,509.60 : x
  2. Step 2: Convert to fraction form
    85,913.70/128,761.20 = 76,509.60/x
  3. Step 3: Cross multiply
    85,913.70x = 128,761.20 × 76,509.60
  4. Step 4: Simplify right side
    85,913.70x = 9,851,467,907.52
  5. Step 5: Solve for x
    x = 9,851,467,907.52/85,913.70
  6. Step 6: Final answer
    x = 114,667.02

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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.