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Finding the Fourth Proportional to 378,436.00, 521,817.43 and 309,311.00

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Solution

The fourth proportional to 378,436.00, 521,817.43 and 309,311.00 is: 426,502.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,436.00 : 521,817.43 = 309,311.00 : x
  2. Step 2: Convert to fraction form
    378,436.00/521,817.43 = 309,311.00/x
  3. Step 3: Cross multiply
    378,436.00x = 521,817.43 × 309,311.00
  4. Step 4: Simplify right side
    378,436.00x = 161,403,869,647.46
  5. Step 5: Solve for x
    x = 161,403,869,647.46/378,436.00
  6. Step 6: Final answer
    x = 426,502.42

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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.