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Finding the Fourth Proportional to 664,980.60, 917,679.10 and 378,519.13

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Solution

The fourth proportional to 664,980.60, 917,679.10 and 378,519.13 is: 522,359.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,980.60 : 917,679.10 = 378,519.13 : x
  2. Step 2: Convert to fraction form
    664,980.60/917,679.10 = 378,519.13/x
  3. Step 3: Cross multiply
    664,980.60x = 917,679.10 × 378,519.13
  4. Step 4: Simplify right side
    664,980.60x = 347,359,094,551.18
  5. Step 5: Solve for x
    x = 347,359,094,551.18/664,980.60
  6. Step 6: Final answer
    x = 522,359.74

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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.