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Finding the Fourth Proportional to 639,511.76, 959,362.41 and 212,908.25

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Solution

The fourth proportional to 639,511.76, 959,362.41 and 212,908.25 is: 319,393.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,511.76 : 959,362.41 = 212,908.25 : x
  2. Step 2: Convert to fraction form
    639,511.76/959,362.41 = 212,908.25/x
  3. Step 3: Cross multiply
    639,511.76x = 959,362.41 × 212,908.25
  4. Step 4: Simplify right side
    639,511.76x = 204,256,167,032.07
  5. Step 5: Solve for x
    x = 204,256,167,032.07/639,511.76
  6. Step 6: Final answer
    x = 319,393.92

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1.5x scale

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.