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Finding the Fourth Proportional to 647,359.20, 905,121.90 and 647,359.20

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Solution

The fourth proportional to 647,359.20, 905,121.90 and 647,359.20 is: 905,121.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,359.20 : 905,121.90 = 647,359.20 : x
  2. Step 2: Convert to fraction form
    647,359.20/905,121.90 = 647,359.20/x
  3. Step 3: Cross multiply
    647,359.20x = 905,121.90 × 647,359.20
  4. Step 4: Simplify right side
    647,359.20x = 585,938,989,086.48
  5. Step 5: Solve for x
    x = 585,938,989,086.48/647,359.20
  6. Step 6: Final answer
    x = 905,121.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.