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Finding the Fourth Proportional to 391,487.78, 540,291.06 and 219,434.97

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Solution

The fourth proportional to 391,487.78, 540,291.06 and 219,434.97 is: 302,841.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,487.78 : 540,291.06 = 219,434.97 : x
  2. Step 2: Convert to fraction form
    391,487.78/540,291.06 = 219,434.97/x
  3. Step 3: Cross multiply
    391,487.78x = 540,291.06 × 219,434.97
  4. Step 4: Simplify right side
    391,487.78x = 118,558,754,568.46
  5. Step 5: Solve for x
    x = 118,558,754,568.46/391,487.78
  6. Step 6: Final answer
    x = 302,841.52

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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.