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Finding the Fourth Proportional to 485,286, 669,615.90 and 281,297.12

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Solution

The fourth proportional to 485,286, 669,615.90 and 281,297.12 is: 388,144.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,286 : 669,615.90 = 281,297.12 : x
  2. Step 2: Convert to fraction form
    485,286/669,615.90 = 281,297.12/x
  3. Step 3: Cross multiply
    485,286x = 669,615.90 × 281,297.12
  4. Step 4: Simplify right side
    485,286x = 188,361,020,828.13
  5. Step 5: Solve for x
    x = 188,361,020,828.13/485,286
  6. Step 6: Final answer
    x = 388,144.35

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1.5x scale

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.