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Finding the Fourth Proportional to 207,219.32, 310,866.56 and 85,640.06

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Solution

The fourth proportional to 207,219.32, 310,866.56 and 85,640.06 is: 128,475.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,219.32 : 310,866.56 = 85,640.06 : x
  2. Step 2: Convert to fraction form
    207,219.32/310,866.56 = 85,640.06/x
  3. Step 3: Cross multiply
    207,219.32x = 310,866.56 × 85,640.06
  4. Step 4: Simplify right side
    207,219.32x = 26,622,629,771.89
  5. Step 5: Solve for x
    x = 26,622,629,771.89/207,219.32
  6. Step 6: Final answer
    x = 128,475.62

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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.