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Finding the Fourth Proportional to 402,489,042.40, 603,733,563.60 and 129,859,809.40

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Solution

The fourth proportional to 402,489,042.40, 603,733,563.60 and 129,859,809.40 is: 194,789,714.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,489,042.40 : 603,733,563.60 = 129,859,809.40 : x
  2. Step 2: Convert to fraction form
    402,489,042.40/603,733,563.60 = 129,859,809.40/x
  3. Step 3: Cross multiply
    402,489,042.40x = 603,733,563.60 × 129,859,809.40
  4. Step 4: Simplify right side
    402,489,042.40x = 78,400,725,497,478,784
  5. Step 5: Solve for x
    x = 78,400,725,497,478,784/402,489,042.40
  6. Step 6: Final answer
    x = 194,789,714.10

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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.