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Finding the Fourth Proportional to 87,485.40, 131,228.10 and 69,989.40

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Solution

The fourth proportional to 87,485.40, 131,228.10 and 69,989.40 is: 104,984.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,485.40 : 131,228.10 = 69,989.40 : x
  2. Step 2: Convert to fraction form
    87,485.40/131,228.10 = 69,989.40/x
  3. Step 3: Cross multiply
    87,485.40x = 131,228.10 × 69,989.40
  4. Step 4: Simplify right side
    87,485.40x = 9,184,575,982.14
  5. Step 5: Solve for x
    x = 9,184,575,982.14/87,485.40
  6. Step 6: Final answer
    x = 104,984.10

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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.