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Finding the Fourth Proportional to 323,816.40, 485,513.40 and 290,638.80

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Solution

The fourth proportional to 323,816.40, 485,513.40 and 290,638.80 is: 435,768.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,816.40 : 485,513.40 = 290,638.80 : x
  2. Step 2: Convert to fraction form
    323,816.40/485,513.40 = 290,638.80/x
  3. Step 3: Cross multiply
    323,816.40x = 485,513.40 × 290,638.80
  4. Step 4: Simplify right side
    323,816.40x = 141,109,031,959.92
  5. Step 5: Solve for x
    x = 141,109,031,959.92/323,816.40
  6. Step 6: Final answer
    x = 435,768.64

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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.