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Finding the Fourth Proportional to 485,220.70, 669,607.23 and 281,392.47

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Solution

The fourth proportional to 485,220.70, 669,607.23 and 281,392.47 is: 388,323.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,220.70 : 669,607.23 = 281,392.47 : x
  2. Step 2: Convert to fraction form
    485,220.70/669,607.23 = 281,392.47/x
  3. Step 3: Cross multiply
    485,220.70x = 669,607.23 × 281,392.47
  4. Step 4: Simplify right side
    485,220.70x = 188,422,432,943.80
  5. Step 5: Solve for x
    x = 188,422,432,943.80/485,220.70
  6. Step 6: Final answer
    x = 388,323.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.