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Finding the Fourth Proportional to 627,429.78, 865,886.28 and 355,550.40

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Solution

The fourth proportional to 627,429.78, 865,886.28 and 355,550.40 is: 490,678.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    627,429.78 : 865,886.28 = 355,550.40 : x
  2. Step 2: Convert to fraction form
    627,429.78/865,886.28 = 355,550.40/x
  3. Step 3: Cross multiply
    627,429.78x = 865,886.28 × 355,550.40
  4. Step 4: Simplify right side
    627,429.78x = 307,866,213,208.51
  5. Step 5: Solve for x
    x = 307,866,213,208.51/627,429.78
  6. Step 6: Final answer
    x = 490,678.36

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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.