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Finding the Fourth Proportional to 261,749.70, 392,697.45 and 128,634.30

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Solution

The fourth proportional to 261,749.70, 392,697.45 and 128,634.30 is: 192,987.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,749.70 : 392,697.45 = 128,634.30 : x
  2. Step 2: Convert to fraction form
    261,749.70/392,697.45 = 128,634.30/x
  3. Step 3: Cross multiply
    261,749.70x = 392,697.45 × 128,634.30
  4. Step 4: Simplify right side
    261,749.70x = 50,514,361,592.54
  5. Step 5: Solve for x
    x = 50,514,361,592.54/261,749.70
  6. Step 6: Final answer
    x = 192,987.28

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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.