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Finding the Fourth Proportional to 391,668.48, 540,515.16 and 221,898.96

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Solution

The fourth proportional to 391,668.48, 540,515.16 and 221,898.96 is: 306,227.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,668.48 : 540,515.16 = 221,898.96 : x
  2. Step 2: Convert to fraction form
    391,668.48/540,515.16 = 221,898.96/x
  3. Step 3: Cross multiply
    391,668.48x = 540,515.16 × 221,898.96
  4. Step 4: Simplify right side
    391,668.48x = 119,939,751,868.23
  5. Step 5: Solve for x
    x = 119,939,751,868.23/391,668.48
  6. Step 6: Final answer
    x = 306,227.74

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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.