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Finding the Fourth Proportional to 391,488.84, 540,236.52 and 221,724.18

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Solution

The fourth proportional to 391,488.84, 540,236.52 and 221,724.18 is: 305,969.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,488.84 : 540,236.52 = 221,724.18 : x
  2. Step 2: Convert to fraction form
    391,488.84/540,236.52 = 221,724.18/x
  3. Step 3: Cross multiply
    391,488.84x = 540,236.52 × 221,724.18
  4. Step 4: Simplify right side
    391,488.84x = 119,783,499,403.05
  5. Step 5: Solve for x
    x = 119,783,499,403.05/391,488.84
  6. Step 6: Final answer
    x = 305,969.13

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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.