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Finding the Fourth Proportional to 479,715, 661,391.34 and 393,355.80

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Solution

The fourth proportional to 479,715, 661,391.34 and 393,355.80 is: 542,326.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,715 : 661,391.34 = 393,355.80 : x
  2. Step 2: Convert to fraction form
    479,715/661,391.34 = 393,355.80/x
  3. Step 3: Cross multiply
    479,715x = 661,391.34 × 393,355.80
  4. Step 4: Simplify right side
    479,715x = 260,162,119,658.77
  5. Step 5: Solve for x
    x = 260,162,119,658.77/479,715
  6. Step 6: Final answer
    x = 542,326.42

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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.