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Finding the Fourth Proportional to 391,140.09, 539,680.80 and 221,374.21

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Solution

The fourth proportional to 391,140.09, 539,680.80 and 221,374.21 is: 305,444.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,140.09 : 539,680.80 = 221,374.21 : x
  2. Step 2: Convert to fraction form
    391,140.09/539,680.80 = 221,374.21/x
  3. Step 3: Cross multiply
    391,140.09x = 539,680.80 × 221,374.21
  4. Step 4: Simplify right side
    391,140.09x = 119,471,410,752.17
  5. Step 5: Solve for x
    x = 119,471,410,752.17/391,140.09
  6. Step 6: Final answer
    x = 305,444.04

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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.