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Finding the Fourth Proportional to 638,735.80, 958,103.70 and 427,228.60

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Solution

The fourth proportional to 638,735.80, 958,103.70 and 427,228.60 is: 640,842.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,735.80 : 958,103.70 = 427,228.60 : x
  2. Step 2: Convert to fraction form
    638,735.80/958,103.70 = 427,228.60/x
  3. Step 3: Cross multiply
    638,735.80x = 958,103.70 × 427,228.60
  4. Step 4: Simplify right side
    638,735.80x = 409,329,302,405.82
  5. Step 5: Solve for x
    x = 409,329,302,405.82/638,735.80
  6. Step 6: Final answer
    x = 640,842.90

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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.