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Finding the Fourth Proportional to 640,345.89, 961,057.68 and 320,401.77

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Solution

The fourth proportional to 640,345.89, 961,057.68 and 320,401.77 is: 480,872.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,345.89 : 961,057.68 = 320,401.77 : x
  2. Step 2: Convert to fraction form
    640,345.89/961,057.68 = 320,401.77/x
  3. Step 3: Cross multiply
    640,345.89x = 961,057.68 × 320,401.77
  4. Step 4: Simplify right side
    640,345.89x = 307,924,581,744.09
  5. Step 5: Solve for x
    x = 307,924,581,744.09/640,345.89
  6. Step 6: Final answer
    x = 480,872.27

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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.