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Finding the Fourth Proportional to 391,016.33, 539,477.13 and 218,909.00

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Solution

The fourth proportional to 391,016.33, 539,477.13 and 218,909.00 is: 302,024.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,016.33 : 539,477.13 = 218,909.00 : x
  2. Step 2: Convert to fraction form
    391,016.33/539,477.13 = 218,909.00/x
  3. Step 3: Cross multiply
    391,016.33x = 539,477.13 × 218,909.00
  4. Step 4: Simplify right side
    391,016.33x = 118,096,396,954.85
  5. Step 5: Solve for x
    x = 118,096,396,954.85/391,016.33
  6. Step 6: Final answer
    x = 302,024.21

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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.