Home / 142,718.20-196,920.78-86,128.60

Finding the Fourth Proportional to 142,718.20, 196,920.78 and 86,128.60

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Solution

The fourth proportional to 142,718.20, 196,920.78 and 86,128.60 is: 118,839.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,718.20 : 196,920.78 = 86,128.60 : x
  2. Step 2: Convert to fraction form
    142,718.20/196,920.78 = 86,128.60/x
  3. Step 3: Cross multiply
    142,718.20x = 196,920.78 × 86,128.60
  4. Step 4: Simplify right side
    142,718.20x = 16,960,511,092.31
  5. Step 5: Solve for x
    x = 16,960,511,092.31/142,718.20
  6. Step 6: Final answer
    x = 118,839.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.