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Finding the Fourth Proportional to 391,488.78, 540,292.44 and 219,435.97

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Solution

The fourth proportional to 391,488.78, 540,292.44 and 219,435.97 is: 302,842.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,488.78 : 540,292.44 = 219,435.97 : x
  2. Step 2: Convert to fraction form
    391,488.78/540,292.44 = 219,435.97/x
  3. Step 3: Cross multiply
    391,488.78x = 540,292.44 × 219,435.97
  4. Step 4: Simplify right side
    391,488.78x = 118,559,595,655.07
  5. Step 5: Solve for x
    x = 118,559,595,655.07/391,488.78
  6. Step 6: Final answer
    x = 302,842.90

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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.