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Finding the Fourth Proportional to 261,007.36, 391,459.20 and 127,830.40

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Solution

The fourth proportional to 261,007.36, 391,459.20 and 127,830.40 is: 191,720.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,007.36 : 391,459.20 = 127,830.40 : x
  2. Step 2: Convert to fraction form
    261,007.36/391,459.20 = 127,830.40/x
  3. Step 3: Cross multiply
    261,007.36x = 391,459.20 × 127,830.40
  4. Step 4: Simplify right side
    261,007.36x = 50,040,386,119.68
  5. Step 5: Solve for x
    x = 50,040,386,119.68/261,007.36
  6. Step 6: Final answer
    x = 191,720.21

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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.