Home / 207,128.20-310,922.70-128,331.40

Finding the Fourth Proportional to 207,128.20, 310,922.70 and 128,331.40

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Solution

The fourth proportional to 207,128.20, 310,922.70 and 128,331.40 is: 192,639.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,128.20 : 310,922.70 = 128,331.40 : x
  2. Step 2: Convert to fraction form
    207,128.20/310,922.70 = 128,331.40/x
  3. Step 3: Cross multiply
    207,128.20x = 310,922.70 × 128,331.40
  4. Step 4: Simplify right side
    207,128.20x = 39,901,145,382.78
  5. Step 5: Solve for x
    x = 39,901,145,382.78/207,128.20
  6. Step 6: Final answer
    x = 192,639.85

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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.