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Finding the Fourth Proportional to 287,679.60, 428,122.73 and 278,100.86

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Solution

The fourth proportional to 287,679.60, 428,122.73 and 278,100.86 is: 413,867.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,679.60 : 428,122.73 = 278,100.86 : x
  2. Step 2: Convert to fraction form
    287,679.60/428,122.73 = 278,100.86/x
  3. Step 3: Cross multiply
    287,679.60x = 428,122.73 × 278,100.86
  4. Step 4: Simplify right side
    287,679.60x = 119,061,295,867.43
  5. Step 5: Solve for x
    x = 119,061,295,867.43/287,679.60
  6. Step 6: Final answer
    x = 413,867.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.