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Finding the Fourth Proportional to 391,636.50, 540,458.91 and 221,882.10

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Solution

The fourth proportional to 391,636.50, 540,458.91 and 221,882.10 is: 306,197.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,636.50 : 540,458.91 = 221,882.10 : x
  2. Step 2: Convert to fraction form
    391,636.50/540,458.91 = 221,882.10/x
  3. Step 3: Cross multiply
    391,636.50x = 540,458.91 × 221,882.10
  4. Step 4: Simplify right side
    391,636.50x = 119,918,157,914.51
  5. Step 5: Solve for x
    x = 119,918,157,914.51/391,636.50
  6. Step 6: Final answer
    x = 306,197.60

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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.