Home / 126,128.20-189,278.70-69,968.20

Finding the Fourth Proportional to 126,128.20, 189,278.70 and 69,968.20

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Solution

The fourth proportional to 126,128.20, 189,278.70 and 69,968.20 is: 105,000.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,128.20 : 189,278.70 = 69,968.20 : x
  2. Step 2: Convert to fraction form
    126,128.20/189,278.70 = 69,968.20/x
  3. Step 3: Cross multiply
    126,128.20x = 189,278.70 × 69,968.20
  4. Step 4: Simplify right side
    126,128.20x = 13,243,489,937.34
  5. Step 5: Solve for x
    x = 13,243,489,937.34/126,128.20
  6. Step 6: Final answer
    x = 105,000.23

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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.