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Finding the Fourth Proportional to 664,980.35, 917,678.75 and 378,518.88

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Solution

The fourth proportional to 664,980.35, 917,678.75 and 378,518.88 is: 522,359.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,980.35 : 917,678.75 = 378,518.88 : x
  2. Step 2: Convert to fraction form
    664,980.35/917,678.75 = 378,518.88/x
  3. Step 3: Cross multiply
    664,980.35x = 917,678.75 × 378,518.88
  4. Step 4: Simplify right side
    664,980.35x = 347,358,732,649.80
  5. Step 5: Solve for x
    x = 347,358,732,649.80/664,980.35
  6. Step 6: Final answer
    x = 522,359.39

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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.