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Finding the Fourth Proportional to 207,485.40, 311,519.70 and 128,753.40

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Solution

The fourth proportional to 207,485.40, 311,519.70 and 128,753.40 is: 193,311.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,485.40 : 311,519.70 = 128,753.40 : x
  2. Step 2: Convert to fraction form
    207,485.40/311,519.70 = 128,753.40/x
  3. Step 3: Cross multiply
    207,485.40x = 311,519.70 × 128,753.40
  4. Step 4: Simplify right side
    207,485.40x = 40,109,220,541.98
  5. Step 5: Solve for x
    x = 40,109,220,541.98/207,485.40
  6. Step 6: Final answer
    x = 193,311.05

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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.