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Finding the Fourth Proportional to 439,970.78, 607,168.28 and 287,106.77

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Solution

The fourth proportional to 439,970.78, 607,168.28 and 287,106.77 is: 396,212.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,970.78 : 607,168.28 = 287,106.77 : x
  2. Step 2: Convert to fraction form
    439,970.78/607,168.28 = 287,106.77/x
  3. Step 3: Cross multiply
    439,970.78x = 607,168.28 × 287,106.77
  4. Step 4: Simplify right side
    439,970.78x = 174,322,123,799.64
  5. Step 5: Solve for x
    x = 174,322,123,799.64/439,970.78
  6. Step 6: Final answer
    x = 396,212.95

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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.