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Finding the Fourth Proportional to 351,781.90, 528,061.65 and 218,812.30

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Solution

The fourth proportional to 351,781.90, 528,061.65 and 218,812.30 is: 328,460.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    351,781.90 : 528,061.65 = 218,812.30 : x
  2. Step 2: Convert to fraction form
    351,781.90/528,061.65 = 218,812.30/x
  3. Step 3: Cross multiply
    351,781.90x = 528,061.65 × 218,812.30
  4. Step 4: Simplify right side
    351,781.90x = 115,546,384,178.30
  5. Step 5: Solve for x
    x = 115,546,384,178.30/351,781.90
  6. Step 6: Final answer
    x = 328,460.29

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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.