Home / 261,908.20-392,603.10-128,679.40

Finding the Fourth Proportional to 261,908.20, 392,603.10 and 128,679.40

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Solution

The fourth proportional to 261,908.20, 392,603.10 and 128,679.40 is: 192,891.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,908.20 : 392,603.10 = 128,679.40 : x
  2. Step 2: Convert to fraction form
    261,908.20/392,603.10 = 128,679.40/x
  3. Step 3: Cross multiply
    261,908.20x = 392,603.10 × 128,679.40
  4. Step 4: Simplify right side
    261,908.20x = 50,519,931,346.14
  5. Step 5: Solve for x
    x = 50,519,931,346.14/261,908.20
  6. Step 6: Final answer
    x = 192,891.75

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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.