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Finding the Fourth Proportional to 395,489.79, 545,748.84 and 221,048.60

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Solution

The fourth proportional to 395,489.79, 545,748.84 and 221,048.60 is: 305,031.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    395,489.79 : 545,748.84 = 221,048.60 : x
  2. Step 2: Convert to fraction form
    395,489.79/545,748.84 = 221,048.60/x
  3. Step 3: Cross multiply
    395,489.79x = 545,748.84 × 221,048.60
  4. Step 4: Simplify right side
    395,489.79x = 120,637,014,304.88
  5. Step 5: Solve for x
    x = 120,637,014,304.88/395,489.79
  6. Step 6: Final answer
    x = 305,031.93

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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.