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Finding the Fourth Proportional to 647,638.80, 971,531.10 and 198,356.10

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Solution

The fourth proportional to 647,638.80, 971,531.10 and 198,356.10 is: 297,556.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,638.80 : 971,531.10 = 198,356.10 : x
  2. Step 2: Convert to fraction form
    647,638.80/971,531.10 = 198,356.10/x
  3. Step 3: Cross multiply
    647,638.80x = 971,531.10 × 198,356.10
  4. Step 4: Simplify right side
    647,638.80x = 192,709,120,024.71
  5. Step 5: Solve for x
    x = 192,709,120,024.71/647,638.80
  6. Step 6: Final answer
    x = 297,556.48

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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.