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Finding the Fourth Proportional to 278,465.21, 417,630.90 and 128,561.48

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Solution

The fourth proportional to 278,465.21, 417,630.90 and 128,561.48 is: 192,811.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,465.21 : 417,630.90 = 128,561.48 : x
  2. Step 2: Convert to fraction form
    278,465.21/417,630.90 = 128,561.48/x
  3. Step 3: Cross multiply
    278,465.21x = 417,630.90 × 128,561.48
  4. Step 4: Simplify right side
    278,465.21x = 53,691,246,597.73
  5. Step 5: Solve for x
    x = 53,691,246,597.73/278,465.21
  6. Step 6: Final answer
    x = 192,811.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.