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Finding the Fourth Proportional to 71,190.60, 106,777.80 and 18,605.40

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Solution

The fourth proportional to 71,190.60, 106,777.80 and 18,605.40 is: 27,905.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,190.60 : 106,777.80 = 18,605.40 : x
  2. Step 2: Convert to fraction form
    71,190.60/106,777.80 = 18,605.40/x
  3. Step 3: Cross multiply
    71,190.60x = 106,777.80 × 18,605.40
  4. Step 4: Simplify right side
    71,190.60x = 1,986,643,680.12
  5. Step 5: Solve for x
    x = 1,986,643,680.12/71,190.60
  6. Step 6: Final answer
    x = 27,905.98

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1.5x scale

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.