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Finding the Fourth Proportional to 351,521.90, 485,109.09 and 215,630.78

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Solution

The fourth proportional to 351,521.90, 485,109.09 and 215,630.78 is: 297,575.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    351,521.90 : 485,109.09 = 215,630.78 : x
  2. Step 2: Convert to fraction form
    351,521.90/485,109.09 = 215,630.78/x
  3. Step 3: Cross multiply
    351,521.90x = 485,109.09 × 215,630.78
  4. Step 4: Simplify right side
    351,521.90x = 104,604,451,461.79
  5. Step 5: Solve for x
    x = 104,604,451,461.79/351,521.90
  6. Step 6: Final answer
    x = 297,575.92

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1.5x scale

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.