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Finding the Fourth Proportional to 85,970.28, 128,788.56 and 48,415.80

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Solution

The fourth proportional to 85,970.28, 128,788.56 and 48,415.80 is: 72,529.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,970.28 : 128,788.56 = 48,415.80 : x
  2. Step 2: Convert to fraction form
    85,970.28/128,788.56 = 48,415.80/x
  3. Step 3: Cross multiply
    85,970.28x = 128,788.56 × 48,415.80
  4. Step 4: Simplify right side
    85,970.28x = 6,235,401,163.25
  5. Step 5: Solve for x
    x = 6,235,401,163.25/85,970.28
  6. Step 6: Final answer
    x = 72,529.73

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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.