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Finding the Fourth Proportional to 512,320.20, 768,569.40 and 212,636.40

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Solution

The fourth proportional to 512,320.20, 768,569.40 and 212,636.40 is: 318,991.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    512,320.20 : 768,569.40 = 212,636.40 : x
  2. Step 2: Convert to fraction form
    512,320.20/768,569.40 = 212,636.40/x
  3. Step 3: Cross multiply
    512,320.20x = 768,569.40 × 212,636.40
  4. Step 4: Simplify right side
    512,320.20x = 163,425,830,366.16
  5. Step 5: Solve for x
    x = 163,425,830,366.16/512,320.20
  6. Step 6: Final answer
    x = 318,991.58

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1.5x scale

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.