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Finding the Fourth Proportional to 638,881.20, 958,321.80 and 479,448.90

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Solution

The fourth proportional to 638,881.20, 958,321.80 and 479,448.90 is: 719,173.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,881.20 : 958,321.80 = 479,448.90 : x
  2. Step 2: Convert to fraction form
    638,881.20/958,321.80 = 479,448.90/x
  3. Step 3: Cross multiply
    638,881.20x = 958,321.80 × 479,448.90
  4. Step 4: Simplify right side
    638,881.20x = 459,466,332,856.02
  5. Step 5: Solve for x
    x = 459,466,332,856.02/638,881.20
  6. Step 6: Final answer
    x = 719,173.35

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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.