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Finding the Fourth Proportional to 918,893.88, 1,378,339.74 and 287,856.84

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Solution

The fourth proportional to 918,893.88, 1,378,339.74 and 287,856.84 is: 431,784.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,893.88 : 1,378,339.74 = 287,856.84 : x
  2. Step 2: Convert to fraction form
    918,893.88/1,378,339.74 = 287,856.84/x
  3. Step 3: Cross multiply
    918,893.88x = 1,378,339.74 × 287,856.84
  4. Step 4: Simplify right side
    918,893.88x = 396,764,522,002.82
  5. Step 5: Solve for x
    x = 396,764,522,002.82/918,893.88
  6. Step 6: Final answer
    x = 431,784.92

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Double scale
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Similar ratio
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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.