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Finding the Fourth Proportional to 386,480.42, 579,644.34 and 130,287.63

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Solution

The fourth proportional to 386,480.42, 579,644.34 and 130,287.63 is: 195,405.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,480.42 : 579,644.34 = 130,287.63 : x
  2. Step 2: Convert to fraction form
    386,480.42/579,644.34 = 130,287.63/x
  3. Step 3: Cross multiply
    386,480.42x = 579,644.34 × 130,287.63
  4. Step 4: Simplify right side
    386,480.42x = 75,520,488,986.60
  5. Step 5: Solve for x
    x = 75,520,488,986.60/386,480.42
  6. Step 6: Final answer
    x = 195,405.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.