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Finding the Fourth Proportional to 485,005.42, 669,307.60 and 281,174.48

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Solution

The fourth proportional to 485,005.42, 669,307.60 and 281,174.48 is: 388,020.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,005.42 : 669,307.60 = 281,174.48 : x
  2. Step 2: Convert to fraction form
    485,005.42/669,307.60 = 281,174.48/x
  3. Step 3: Cross multiply
    485,005.42x = 669,307.60 × 281,174.48
  4. Step 4: Simplify right side
    485,005.42x = 188,192,216,390.05
  5. Step 5: Solve for x
    x = 188,192,216,390.05/485,005.42
  6. Step 6: Final answer
    x = 388,020.85

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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.