Home / 391,139.09-539,679.43-221,373.21

Finding the Fourth Proportional to 391,139.09, 539,679.43 and 221,373.21

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Solution

The fourth proportional to 391,139.09, 539,679.43 and 221,373.21 is: 305,442.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,139.09 : 539,679.43 = 221,373.21 : x
  2. Step 2: Convert to fraction form
    391,139.09/539,679.43 = 221,373.21/x
  3. Step 3: Cross multiply
    391,139.09x = 539,679.43 × 221,373.21
  4. Step 4: Simplify right side
    391,139.09x = 119,470,566,683.20
  5. Step 5: Solve for x
    x = 119,470,566,683.20/391,139.09
  6. Step 6: Final answer
    x = 305,442.67

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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.