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Finding the Fourth Proportional to 764,640.84, 1,055,230.86 and 420,490.86

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Solution

The fourth proportional to 764,640.84, 1,055,230.86 and 420,490.86 is: 580,291.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    764,640.84 : 1,055,230.86 = 420,490.86 : x
  2. Step 2: Convert to fraction form
    764,640.84/1,055,230.86 = 420,490.86/x
  3. Step 3: Cross multiply
    764,640.84x = 1,055,230.86 × 420,490.86
  4. Step 4: Simplify right side
    764,640.84x = 443,714,931,819.94
  5. Step 5: Solve for x
    x = 443,714,931,819.94/764,640.84
  6. Step 6: Final answer
    x = 580,291.96

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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.