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Finding the Fourth Proportional to 485,333.85, 669,762.95 and 281,505.45

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Solution

The fourth proportional to 485,333.85, 669,762.95 and 281,505.45 is: 388,478.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,333.85 : 669,762.95 = 281,505.45 : x
  2. Step 2: Convert to fraction form
    485,333.85/669,762.95 = 281,505.45/x
  3. Step 3: Cross multiply
    485,333.85x = 669,762.95 × 281,505.45
  4. Step 4: Simplify right side
    485,333.85x = 188,541,915,876.74
  5. Step 5: Solve for x
    x = 188,541,915,876.74/485,333.85
  6. Step 6: Final answer
    x = 388,478.81

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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.