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Finding the Fourth Proportional to 279,378.44, 385,616.39 and 172,038.43

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Solution

The fourth proportional to 279,378.44, 385,616.39 and 172,038.43 is: 237,458.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,378.44 : 385,616.39 = 172,038.43 : x
  2. Step 2: Convert to fraction form
    279,378.44/385,616.39 = 172,038.43/x
  3. Step 3: Cross multiply
    279,378.44x = 385,616.39 × 172,038.43
  4. Step 4: Simplify right side
    279,378.44x = 66,340,838,907.41
  5. Step 5: Solve for x
    x = 66,340,838,907.41/279,378.44
  6. Step 6: Final answer
    x = 237,458.69

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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.