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Finding the Fourth Proportional to 85,356.20, 128,034.30 and 40,960.10

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Solution

The fourth proportional to 85,356.20, 128,034.30 and 40,960.10 is: 61,440.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,356.20 : 128,034.30 = 40,960.10 : x
  2. Step 2: Convert to fraction form
    85,356.20/128,034.30 = 40,960.10/x
  3. Step 3: Cross multiply
    85,356.20x = 128,034.30 × 40,960.10
  4. Step 4: Simplify right side
    85,356.20x = 5,244,297,731.43
  5. Step 5: Solve for x
    x = 5,244,297,731.43/85,356.20
  6. Step 6: Final answer
    x = 61,440.15

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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.