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Finding the Fourth Proportional to 639,444.87, 958,959.69 and 212,866.11

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Solution

The fourth proportional to 639,444.87, 958,959.69 and 212,866.11 is: 319,230.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,444.87 : 958,959.69 = 212,866.11 : x
  2. Step 2: Convert to fraction form
    639,444.87/958,959.69 = 212,866.11/x
  3. Step 3: Cross multiply
    639,444.87x = 958,959.69 × 212,866.11
  4. Step 4: Simplify right side
    639,444.87x = 204,130,018,857.11
  5. Step 5: Solve for x
    x = 204,130,018,857.11/639,444.87
  6. Step 6: Final answer
    x = 319,230.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.