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Finding the Fourth Proportional to 665,003, 917,709.97 and 378,541.51

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Solution

The fourth proportional to 665,003, 917,709.97 and 378,541.51 is: 522,390.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,003 : 917,709.97 = 378,541.51 : x
  2. Step 2: Convert to fraction form
    665,003/917,709.97 = 378,541.51/x
  3. Step 3: Cross multiply
    665,003x = 917,709.97 × 378,541.51
  4. Step 4: Simplify right side
    665,003x = 347,391,317,785.86
  5. Step 5: Solve for x
    x = 347,391,317,785.86/665,003
  6. Step 6: Final answer
    x = 522,390.60

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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.