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Finding the Fourth Proportional to 938,379, 1,296,032.40 and 636,048.12

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Solution

The fourth proportional to 938,379, 1,296,032.40 and 636,048.12 is: 878,471.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    938,379 : 1,296,032.40 = 636,048.12 : x
  2. Step 2: Convert to fraction form
    938,379/1,296,032.40 = 636,048.12/x
  3. Step 3: Cross multiply
    938,379x = 1,296,032.40 × 636,048.12
  4. Step 4: Simplify right side
    938,379x = 824,338,971,479.09
  5. Step 5: Solve for x
    x = 824,338,971,479.09/938,379
  6. Step 6: Final answer
    x = 878,471.25

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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.