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Finding the Fourth Proportional to 137,903.60, 207,049.80 and 85,415.60

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Solution

The fourth proportional to 137,903.60, 207,049.80 and 85,415.60 is: 128,243.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,903.60 : 207,049.80 = 85,415.60 : x
  2. Step 2: Convert to fraction form
    137,903.60/207,049.80 = 85,415.60/x
  3. Step 3: Cross multiply
    137,903.60x = 207,049.80 × 85,415.60
  4. Step 4: Simplify right side
    137,903.60x = 17,685,282,896.88
  5. Step 5: Solve for x
    x = 17,685,282,896.88/137,903.60
  6. Step 6: Final answer
    x = 128,243.81

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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.