Home / 138,623.80-207,935.70-128,126.20

Finding the Fourth Proportional to 138,623.80, 207,935.70 and 128,126.20

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Solution

The fourth proportional to 138,623.80, 207,935.70 and 128,126.20 is: 192,189.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,623.80 : 207,935.70 = 128,126.20 : x
  2. Step 2: Convert to fraction form
    138,623.80/207,935.70 = 128,126.20/x
  3. Step 3: Cross multiply
    138,623.80x = 207,935.70 × 128,126.20
  4. Step 4: Simplify right side
    138,623.80x = 26,642,011,085.34
  5. Step 5: Solve for x
    x = 26,642,011,085.34/138,623.80
  6. Step 6: Final answer
    x = 192,189.30

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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.