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Finding the Fourth Proportional to 320,431.20, 480,128.40 and 201,890.40

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Solution

The fourth proportional to 320,431.20, 480,128.40 and 201,890.40 is: 302,508.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,431.20 : 480,128.40 = 201,890.40 : x
  2. Step 2: Convert to fraction form
    320,431.20/480,128.40 = 201,890.40/x
  3. Step 3: Cross multiply
    320,431.20x = 480,128.40 × 201,890.40
  4. Step 4: Simplify right side
    320,431.20x = 96,933,314,727.36
  5. Step 5: Solve for x
    x = 96,933,314,727.36/320,431.20
  6. Step 6: Final answer
    x = 302,508.98

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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.