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Finding the Fourth Proportional to 124,911.80, 186,978.90 and 72,164.60

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Solution

The fourth proportional to 124,911.80, 186,978.90 and 72,164.60 is: 108,022.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,911.80 : 186,978.90 = 72,164.60 : x
  2. Step 2: Convert to fraction form
    124,911.80/186,978.90 = 72,164.60/x
  3. Step 3: Cross multiply
    124,911.80x = 186,978.90 × 72,164.60
  4. Step 4: Simplify right side
    124,911.80x = 13,493,257,526.94
  5. Step 5: Solve for x
    x = 13,493,257,526.94/124,911.80
  6. Step 6: Final answer
    x = 108,022.28

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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.