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Finding the Fourth Proportional to 640,358.60, 961,187.85 and 320,739.48

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Solution

The fourth proportional to 640,358.60, 961,187.85 and 320,739.48 is: 481,434.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,358.60 : 961,187.85 = 320,739.48 : x
  2. Step 2: Convert to fraction form
    640,358.60/961,187.85 = 320,739.48/x
  3. Step 3: Cross multiply
    640,358.60x = 961,187.85 × 320,739.48
  4. Step 4: Simplify right side
    640,358.60x = 308,290,896,599.45
  5. Step 5: Solve for x
    x = 308,290,896,599.45/640,358.60
  6. Step 6: Final answer
    x = 481,434.77

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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.