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Finding the Fourth Proportional to 391,355.52, 540,072.72 and 221,622.72

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Solution

The fourth proportional to 391,355.52, 540,072.72 and 221,622.72 is: 305,840.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,355.52 : 540,072.72 = 221,622.72 : x
  2. Step 2: Convert to fraction form
    391,355.52/540,072.72 = 221,622.72/x
  3. Step 3: Cross multiply
    391,355.52x = 540,072.72 × 221,622.72
  4. Step 4: Simplify right side
    391,355.52x = 119,692,385,204.20
  5. Step 5: Solve for x
    x = 119,692,385,204.20/391,355.52
  6. Step 6: Final answer
    x = 305,840.54

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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.