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Finding the Fourth Proportional to 351,519.90, 485,106.33 and 215,628.78

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Solution

The fourth proportional to 351,519.90, 485,106.33 and 215,628.78 is: 297,573.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    351,519.90 : 485,106.33 = 215,628.78 : x
  2. Step 2: Convert to fraction form
    351,519.90/485,106.33 = 215,628.78/x
  3. Step 3: Cross multiply
    351,519.90x = 485,106.33 × 215,628.78
  4. Step 4: Simplify right side
    351,519.90x = 104,602,886,108.18
  5. Step 5: Solve for x
    x = 104,602,886,108.18/351,519.90
  6. Step 6: Final answer
    x = 297,573.16

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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.