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Finding the Fourth Proportional to 320,427.20, 480,640.80 and 291,396.80

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Solution

The fourth proportional to 320,427.20, 480,640.80 and 291,396.80 is: 437,095.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,427.20 : 480,640.80 = 291,396.80 : x
  2. Step 2: Convert to fraction form
    320,427.20/480,640.80 = 291,396.80/x
  3. Step 3: Cross multiply
    320,427.20x = 480,640.80 × 291,396.80
  4. Step 4: Simplify right side
    320,427.20x = 140,057,191,069.44
  5. Step 5: Solve for x
    x = 140,057,191,069.44/320,427.20
  6. Step 6: Final answer
    x = 437,095.20

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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.