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Finding the Fourth Proportional to 512,062.88, 768,094.40 and 138,085.92

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Solution

The fourth proportional to 512,062.88, 768,094.40 and 138,085.92 is: 207,128.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    512,062.88 : 768,094.40 = 138,085.92 : x
  2. Step 2: Convert to fraction form
    512,062.88/768,094.40 = 138,085.92/x
  3. Step 3: Cross multiply
    512,062.88x = 768,094.40 × 138,085.92
  4. Step 4: Simplify right side
    512,062.88x = 106,063,021,870.85
  5. Step 5: Solve for x
    x = 106,063,021,870.85/512,062.88
  6. Step 6: Final answer
    x = 207,128.90

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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.