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Finding the Fourth Proportional to 690,129.30, 952,356.79 and 399,746.54

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Solution

The fourth proportional to 690,129.30, 952,356.79 and 399,746.54 is: 551,637.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    690,129.30 : 952,356.79 = 399,746.54 : x
  2. Step 2: Convert to fraction form
    690,129.30/952,356.79 = 399,746.54/x
  3. Step 3: Cross multiply
    690,129.30x = 952,356.79 × 399,746.54
  4. Step 4: Simplify right side
    690,129.30x = 380,701,324,887.49
  5. Step 5: Solve for x
    x = 380,701,324,887.49/690,129.30
  6. Step 6: Final answer
    x = 551,637.68

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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.