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Finding the Fourth Proportional to 432,043.80, 647,979.30 and 207,403.80

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Solution

The fourth proportional to 432,043.80, 647,979.30 and 207,403.80 is: 311,064.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    432,043.80 : 647,979.30 = 207,403.80 : x
  2. Step 2: Convert to fraction form
    432,043.80/647,979.30 = 207,403.80/x
  3. Step 3: Cross multiply
    432,043.80x = 647,979.30 × 207,403.80
  4. Step 4: Simplify right side
    432,043.80x = 134,393,369,141.34
  5. Step 5: Solve for x
    x = 134,393,369,141.34/432,043.80
  6. Step 6: Final answer
    x = 311,064.22

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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.