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Finding the Fourth Proportional to 328,394.76, 492,612.90 and 138,819.80

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Solution

The fourth proportional to 328,394.76, 492,612.90 and 138,819.80 is: 208,238.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,394.76 : 492,612.90 = 138,819.80 : x
  2. Step 2: Convert to fraction form
    328,394.76/492,612.90 = 138,819.80/x
  3. Step 3: Cross multiply
    328,394.76x = 492,612.90 × 138,819.80
  4. Step 4: Simplify right side
    328,394.76x = 68,384,421,792.36
  5. Step 5: Solve for x
    x = 68,384,421,792.36/328,394.76
  6. Step 6: Final answer
    x = 208,238.47

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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.