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Finding the Fourth Proportional to 318,945.40, 478,418.10 and 219,412.60

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Solution

The fourth proportional to 318,945.40, 478,418.10 and 219,412.60 is: 329,118.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,945.40 : 478,418.10 = 219,412.60 : x
  2. Step 2: Convert to fraction form
    318,945.40/478,418.10 = 219,412.60/x
  3. Step 3: Cross multiply
    318,945.40x = 478,418.10 × 219,412.60
  4. Step 4: Simplify right side
    318,945.40x = 104,970,959,208.06
  5. Step 5: Solve for x
    x = 104,970,959,208.06/318,945.40
  6. Step 6: Final answer
    x = 329,118.90

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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.