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Finding the Fourth Proportional to 664,221.48, 916,645.86 and 377,782.80

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Solution

The fourth proportional to 664,221.48, 916,645.86 and 377,782.80 is: 521,351.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,221.48 : 916,645.86 = 377,782.80 : x
  2. Step 2: Convert to fraction form
    664,221.48/916,645.86 = 377,782.80/x
  3. Step 3: Cross multiply
    664,221.48x = 916,645.86 × 377,782.80
  4. Step 4: Simplify right side
    664,221.48x = 346,293,039,599.21
  5. Step 5: Solve for x
    x = 346,293,039,599.21/664,221.48
  6. Step 6: Final answer
    x = 521,351.76

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Double scale
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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.