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Finding the Fourth Proportional to 391,554.61, 540,345.33 and 221,788.73

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Solution

The fourth proportional to 391,554.61, 540,345.33 and 221,788.73 is: 306,068.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,554.61 : 540,345.33 = 221,788.73 : x
  2. Step 2: Convert to fraction form
    391,554.61/540,345.33 = 221,788.73/x
  3. Step 3: Cross multiply
    391,554.61x = 540,345.33 × 221,788.73
  4. Step 4: Simplify right side
    391,554.61x = 119,842,505,852.99
  5. Step 5: Solve for x
    x = 119,842,505,852.99/391,554.61
  6. Step 6: Final answer
    x = 306,068.43

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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.